3(r-1)+2(r-1)=-20

Solution for 3(r-1)+2(r-1)=-20 equation:

3(r-1)+2(r-1)=-20

We simplify the equation to the form, which is simple to understand 
3(r-1)+2(r-1)=-20

Reorder the terms in parentheses
+(+3r-3)+2*(r-1)=-20

Remove unnecessary parentheses
+3r-3+2+*(+r-1+)=-20

Reorder the terms in parentheses
+3r-3+(+2r-2)=-20

Remove unnecessary parentheses
+3r-3+2r-2=-20

We move all terms containing r to the left and all other terms to the right. 
+3r+2r=-20+3+2

We simplify left and right side of the equation. 
+5r=-15

We divide both sides of the equation by 5 to get r. 
r=-3