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3(b-3)=21
We simplify the equation to the form, which is simple to understand
3(b-3)=21
Reorder the terms in parentheses
+(+3b-9)=21
Remove unnecessary parentheses
+3b-9=+21
We move all terms containing b to the left and all other terms to the right.
+3b=+21+9
We simplify left and right side of the equation.
+3b=+30
We divide both sides of the equation by 3 to get b.
b=10
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