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-7(x+8)=21
We simplify the equation to the form, which is simple to understand
-7(x+8)=21
Reorder the terms in parentheses
+(-7x-56)=21
Remove unnecessary parentheses
-7x-56=+21
We move all terms containing x to the left and all other terms to the right.
-7x=+21+56
We simplify left and right side of the equation.
-7x=+77
We divide both sides of the equation by -7 to get x.
x=-11
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