-3(r-4)=-3(3r+10)

Solution for -3(r-4)=-3(3r+10) equation:

-3(r-4)=-3(3r+10)

We simplify the equation to the form, which is simple to understand 
-3(r-4)=-3(3r+10)

Reorder the terms in parentheses
+(-3r+12)=-3*(3r+10)

Remove unnecessary parentheses
-3r+12=-3+*(+3r+10+)

Reorder the terms in parentheses
-3r+12=+(-9r-30)

Remove unnecessary parentheses
-3r+12=-9r-30

We move all terms containing r to the left and all other terms to the right. 
-3r+9r=-30-12

We simplify left and right side of the equation. 
+6r=-42

We divide both sides of the equation by 6 to get r. 
r=-7