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-3(7+7x)=-42
We simplify the equation to the form, which is simple to understand
-3(7+7x)=-42
Reorder the terms in parentheses
+(-21-21x)=-42
Remove unnecessary parentheses
-21-21x=-42
We move all terms containing x to the left and all other terms to the right.
-21x=-42+21
We simplify left and right side of the equation.
-21x=-21
We divide both sides of the equation by -21 to get x.
x=1
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