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91=1/2(7)(12+b)
We simplify the equation to the form, which is simple to understand
91=1/2(7)*(12+b)
Simplifying:
91=0.5*(7)*(12+b)
Reorder the terms in parentheses
multiplication of parentheses
91=0.5*(+84+7b)
Reorder the terms in parentheses
91=+(+42+3.5b)
Remove unnecessary parentheses
+91=+42+3.5b
We move all terms containing b to the left and all other terms to the right.
-3.5b=+42-91
We simplify left and right side of the equation.
-3.5b=-49
We divide both sides of the equation by -03.5 to get b.
b=14
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