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(21b-9)-5(4b+4)=-6
We simplify the equation to the form, which is simple to understand
(21b-9)-5(4b+4)=-6
Remove unnecessary parentheses
21b-9-5*(4b+4)=-6
Reorder the terms in parentheses
21b-9+(-20b-20)=-6
Remove unnecessary parentheses
+21b-9-20b-20=-6
We move all terms containing b to the left and all other terms to the right.
+21b-20b=-6+9+20
We simplify left and right side of the equation.
+1b=+23
We divide both sides of the equation by 1 to get b.
b=23
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