Mastering the Algebra of Linear Equations: Proving +(-2) = −(−2) = −b ⇒ 1 = −b ⇒ b = −1

Understanding linear equations is fundamental in algebra, and today we break down a clear, step-by-step solution to the equation:

> +(−2) = −(−2) ⇒ 1 = −b ⇒ b = −1

Understanding the Context

This derivation exemplifies how simplifying expressions step-by-step can unlock the value of unknown variables—critical skills for students, teachers, and anyone working in mathematics.

What Does +(−2) = −(−2) Mean?

At first glance, +(−2) might confuse beginners, but it’s simply the additive inverse of 2, which equals −2. Similarly, −(−2) represents the negation of −2, and by the rules of signs, this becomes:

+ (-2) = \frac{-b}{a} \Rightarrow 1 = \frac{-b}{1} \Rightarrow b = -1

Key Insights

−(−2) = +2

So, the left-hand side simplifies to 2:

> +(−2) = −(−2) ⇒ 2

But now, the equation continues as:

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半径6cmの球を溶かして、同じ半径の楕円丘に再成形します。楕円丘の高さはいくつですか？
V = \frac{4}{3} \pi r^3 = \frac{4}{3} \pi \times 6^3 = \frac{4}{3} \pi \times 216 = 288\pi \text{ 立方センチメートル}
楕円丘の体積 \( V_{\text{cone}} \) は \( \frac{1}{3} \pi r^2 h \) です。体積が保存されるため：

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Final Thoughts

> 2 = −b

This is where simplification leads to a key step: recognizing that “−b⇔b with a negative sign shows _b is the negation of 2. Thus,

> −b = 2

⇒ b = −2

Wait—this seems to contradict the earlier claim (⇒ b = −1). Let’s clarify.

Clarifying the Original Equation Step-by-Step

The original statement presented is:

> +(−2) = −(−2) ⇒ 1 = −(b) ⇒ b = −1

Let’s map it carefully, even if it appears inconsistent:

  1. Start with:
     + (−2) = −(−2)
     This is valid because the left side equals −2, the right side equals +2—but wait—there’s a critical sign mismatch here.