-3b-8b=7(b+2)-7(b+2)

Solution for -3b-8b=7(b+2)-7(b+2) equation:

-3b-8b=7(b+2)-7(b+2)

We simplify the equation to the form, which is simple to understand 
-3b-8b=7(b+2)-7(b+2)

Reorder the terms in parentheses
-3b-8b=+(+7b+14)-7*(b+2)

Remove unnecessary parentheses
-3b-8b=+7b+14-7+*(+b+2+)

Reorder the terms in parentheses
-3b-8b=+7b+14+(-7b-14)

Remove unnecessary parentheses
-3b-8b=+7b+14-7b-14

We move all terms containing b to the left and all other terms to the right. 
-3b-8b-7b+7b=+14-14

We simplify left and right side of the equation. 
-11b=0

We divide both sides of the equation by -11 to get b. 
b=-0