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97.5*.75+x*.25=90
We simplify the equation to the form, which is simple to understand
97.5*.75+x*.25=90
We move all terms containing x to the left and all other terms to the right.
+ 0.25x=+90-73.125
We simplify left and right side of the equation.
+ 0.25x=+16.875
We divide both sides of the equation by 0.25 to get x.
x=67.5
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