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12x-131=100+x
We simplify the equation to the form, which is simple to understand
12x-131=100+x
We move all terms containing x to the left and all other terms to the right.
+12x-1x=+100+131
We simplify left and right side of the equation.
+11x=+231
We divide both sides of the equation by 11 to get x.
x=21
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