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7x+3(-9+x)=7(x+6)
We simplify the equation to the form, which is simple to understand
7x+3(-9+x)=7(x+6)
Reorder the terms in parentheses
7x+(-27+3x)=7*(x+6)
Remove unnecessary parentheses
+7x-27+3x=+7+*(+x+6+)
Reorder the terms in parentheses
7x-27+3x=+(+7x+42)
Remove unnecessary parentheses
+7x-27+3x=+7x+42
We move all terms containing x to the left and all other terms to the right.
+7x+3x-7x=+42+27
We simplify left and right side of the equation.
+3x=+69
We divide both sides of the equation by 3 to get x.
x=23
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