Question

-3(2r+7)=3 solve for r

Answer 1

-3(2r+7)=3
-6r + -42=3
+42 +42
-6r =45
Then all you do is divide

Answer 2

-3(2r+7)=3
Opening the brackets;
-6r-21=3
-6r=3+21
-6r=24
r=-4