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90*2=100+x
We simplify the equation to the form, which is simple to understand
90*2=100+x
Simplifying:
+180=100+x
We move all terms containing x to the left and all other terms to the right.
-1x=+100-180
We simplify left and right side of the equation.
-1x=-80
We divide both sides of the equation by -01 to get x.
x=80
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