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99=.5*54+18x
We simplify the equation to the form, which is simple to understand
99=.5*54+18x
We move all terms containing x to the left and all other terms to the right.
-18x=+27-99
We simplify left and right side of the equation.
-18x=-72
We divide both sides of the equation by -018 to get x.
x=4
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