Question

solve for r.
-3r + 1 = 7
r =?

Explanation:

Step1: Isolate the term with r

Subtract 1 from both sides.
$-3r+1 - 1=7 - 1$
$-3r = 6$

Step2: Solve for r

Divide both sides by -3.
$\frac{-3r}{-3}=\frac{6}{-3}$
$r=-2$

Answer:

$-2$