Question

1. -1 = -3r + 2r

Explanation:

Step1: Combine like - terms

Combine $-3r$ and $2r$ on the right - hand side of the equation. $-3r + 2r=-r$. So the equation becomes $-1=-r$.

Step2: Solve for $r$

Multiply both sides of the equation by $- 1$ to isolate $r$. $(-1)\times(-1)=(-1)\times(-r)$.

Answer:

$r = 1$