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90=82+91+86+100/x
We simplify the equation to the form, which is simple to understand
90=82+91+86+100/x
We move all terms containing x to the left and all other terms to the right.
-1x=+82+91+86-90
We simplify left and right side of the equation.
-1x=+169
We divide both sides of the equation by -01 to get x.
x=-169
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