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400=8(b-12)+4b
We simplify the equation to the form, which is simple to understand
400=8(b-12)+4b
Reorder the terms in parentheses
400=+(+8b-96)+4b
Remove unnecessary parentheses
+400=+8b-96+4b
We move all terms containing b to the left and all other terms to the right.
-8b-4b=-96-400
We simplify left and right side of the equation.
-12b=-496
We divide both sides of the equation by -12 to get b.
b=41.333333333333
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