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3(7-3x)=-15
We simplify the equation to the form, which is simple to understand
3(7-3x)=-15
Reorder the terms in parentheses
+(+21-9x)=-15
Remove unnecessary parentheses
+21-9x=-15
We move all terms containing x to the left and all other terms to the right.
-9x=-15-21
We simplify left and right side of the equation.
-9x=-36
We divide both sides of the equation by -9 to get x.
x=4
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