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7(-1+2x)=-21
We simplify the equation to the form, which is simple to understand
7(-1+2x)=-21
Reorder the terms in parentheses
+(-7+14x)=-21
Remove unnecessary parentheses
-7+14x=-21
We move all terms containing x to the left and all other terms to the right.
+14x=-21+7
We simplify left and right side of the equation.
+14x=-14
We divide both sides of the equation by 14 to get x.
x=-1
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