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7500=.5(75)(90+b)
We simplify the equation to the form, which is simple to understand
7500=.5(75)*(90+b)
Reorder the terms in parentheses
multiplication of parentheses
7500=.5*(+6750+75b)
Reorder the terms in parentheses
7500=+(+3375+37.5b)
Remove unnecessary parentheses
+7500=+3375+37.5b
We move all terms containing b to the left and all other terms to the right.
-37.5b=+3375-7500
We simplify left and right side of the equation.
-37.5b=-4125
We divide both sides of the equation by -037.5 to get b.
b=110
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