-8=4(r+1)-3(5r-7)

Solution for -8=4(r+1)-3(5r-7) equation:

-8=4(r+1)-3(5r-7)

We simplify the equation to the form, which is simple to understand 
-8=4(r+1)-3(5r-7)

Reorder the terms in parentheses
-8=+(+4r+4)-3*(5r-7)

Remove unnecessary parentheses
-8=+4r+4-3+*(+5r-7+)

Reorder the terms in parentheses
-8=+4r+4+(-15r+21)

Remove unnecessary parentheses
-8=+4r+4-15r+21

We move all terms containing r to the left and all other terms to the right. 
-4r+15r=+4+21+8

We simplify left and right side of the equation. 
+11r=+33

We divide both sides of the equation by 11 to get r. 
r=3