Question

2(r+3)=10
r+3=
Divide both sides by 2
r=
Subtract 3 from both sides

Answer 1

Start with 2(r + 3) = 10.

Divide both sides by 2:
r + 3 = 5

Subtract 3 from both sides:
r = 2

Check: 2(2 + 3) = 2·5 = 10, so r = 2 is correct.