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-81=9(3-x)
We simplify the equation to the form, which is simple to understand
-81=9(3-x)
Reorder the terms in parentheses
-81=+(+27-9x)
Remove unnecessary parentheses
-81=+27-9x
We move all terms containing x to the left and all other terms to the right.
+9x=+27+81
We simplify left and right side of the equation.
+9x=+108
We divide both sides of the equation by 09 to get x.
x=12
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