6(-1+r)-6(1+3r)=-24

Solution for 6(-1+r)-6(1+3r)=-24 equation:

6(-1+r)-6(1+3r)=-24

We simplify the equation to the form, which is simple to understand 
6(-1+r)-6(1+3r)=-24

Reorder the terms in parentheses
+(-6+6r)-6*(1+3r)=-24

Remove unnecessary parentheses
-6+6r-6+*(+1+3r+)=-24

Reorder the terms in parentheses
-6+6r+(-6-18r)=-24

Remove unnecessary parentheses
-6+6r-6-18r=-24

We move all terms containing r to the left and all other terms to the right. 
+6r-18r=-24+6+6

We simplify left and right side of the equation. 
-12r=-12

We divide both sides of the equation by -12 to get r. 
r=1