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-4(-12-15b)=-5(-12b-12)
We simplify the equation to the form, which is simple to understand
-4(-12-15b)=-5(-12b-12)
Reorder the terms in parentheses
+(+48+60b)=-5*(-12b-12)
Remove unnecessary parentheses
+48+60b=-5+*(-12b-12+)
Reorder the terms in parentheses
+48+60b=+(+60b+60)
Remove unnecessary parentheses
+48+60b=+60b+60
We move all terms containing b to the left and all other terms to the right.
+60b-60b=+60-48
We simplify left and right side of the equation.
b=+12
0=12
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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