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7(-3+3x)=-21-3x
We simplify the equation to the form, which is simple to understand
7(-3+3x)=-21-3x
Reorder the terms in parentheses
+(-21+21x)=-21-3x
Remove unnecessary parentheses
-21+21x=-21-3x
We move all terms containing x to the left and all other terms to the right.
+21x+3x=-21+21
We simplify left and right side of the equation.
+24x=0
We divide both sides of the equation by 24 to get x.
x=0
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