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90-2.50b=0
We simplify the equation to the form, which is simple to understand
90-2.50b=0
We move all terms containing b to the left and all other terms to the right.
-2.5b=0-90
We simplify left and right side of the equation.
-2.5b=-90
We divide both sides of the equation by -2.5 to get b.
b=36
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