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25=b/12+21
We simplify the equation to the form, which is simple to understand
25=b/12+21
Simplifying:
25=0.0833333333333b+21
We move all terms containing b to the left and all other terms to the right.
-0.0833333333333b=+21-25
We simplify left and right side of the equation.
-0.0833333333333b=-4
We divide both sides of the equation by -00.0833333333333 to get b.
b=48
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