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(21b-9)-5(4b+1)=-7
We simplify the equation to the form, which is simple to understand
(21b-9)-5(4b+1)=-7
Remove unnecessary parentheses
21b-9-5*(4b+1)=-7
Reorder the terms in parentheses
21b-9+(-20b-5)=-7
Remove unnecessary parentheses
+21b-9-20b-5=-7
We move all terms containing b to the left and all other terms to the right.
+21b-20b=-7+9+5
We simplify left and right side of the equation.
+1b=+7
We divide both sides of the equation by 1 to get b.
b=7
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