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20--10x=-18x+91
We simplify the equation to the form, which is simple to understand
20+10x=-18x+91
We move all terms containing x to the left and all other terms to the right.
+10x+18x=+91-20
We simplify left and right side of the equation.
+28x=+71
We divide both sides of the equation by 28 to get x.
x=2.53571428571
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