-2(3-2b)-3(1-b)=40

Solution for -2(3-2b)-3(1-b)=40 equation:

-2(3-2b)-3(1-b)=40

We simplify the equation to the form, which is simple to understand 
-2(3-2b)-3(1-b)=40

Reorder the terms in parentheses
+(-6+4b)-3*(1-b)=40

Remove unnecessary parentheses
-6+4b-3+*(+1-b+)=+40

Reorder the terms in parentheses
-6+4b+(-3+3b)=40

Remove unnecessary parentheses
-6+4b-3+3b=+40

We move all terms containing b to the left and all other terms to the right. 
+4b+3b=+40+6+3

We simplify left and right side of the equation. 
+7b=+49

We divide both sides of the equation by 7 to get b. 
b=7