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-91-2x=-9x+56
We simplify the equation to the form, which is simple to understand
-91-2x=-9x+56
We move all terms containing x to the left and all other terms to the right.
-2x+9x=+56+91
We simplify left and right side of the equation.
+7x=+147
We divide both sides of the equation by 7 to get x.
x=21
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