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3x+3(6-x)=7(x-7)+4
We simplify the equation to the form, which is simple to understand
3x+3(6-x)=7(x-7)+4
Reorder the terms in parentheses
3x+(+18-3x)=7*(x-7)+4
Remove unnecessary parentheses
+3x+18-3x=+7+*(+x-7+)+4
Reorder the terms in parentheses
3x+18-3x=+(+7x-49)+4
Remove unnecessary parentheses
+3x+18-3x=+7x-49+4
We move all terms containing x to the left and all other terms to the right.
+3x-3x-7x=-49+4-18
We simplify left and right side of the equation.
-7x=-63
We divide both sides of the equation by -7 to get x.
x=9
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