Question

1. r - 5 = -10 + 2r

Explanation:

Step1: Isolate r terms on left

Subtract $2r$ from both sides.
$r - 5 - 2r = -10 + 2r - 2r$
$-r - 5 = -10$

Step2: Isolate the r term

Add 5 to both sides.
$-r - 5 + 5 = -10 + 5$
$-r = -5$

Step3: Solve for r

Multiply both sides by -1.
$-r \times (-1) = -5 \times (-1)$
$r = 5$

Answer:

$r=5$