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-3(x+7)=-9
We simplify the equation to the form, which is simple to understand
-3(x+7)=-9
Reorder the terms in parentheses
+(-3x-21)=-9
Remove unnecessary parentheses
-3x-21=-9
We move all terms containing x to the left and all other terms to the right.
-3x=-9+21
We simplify left and right side of the equation.
-3x=+12
We divide both sides of the equation by -3 to get x.
x=-4
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