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135=3(7x-4)
We simplify the equation to the form, which is simple to understand
135=3(7x-4)
Reorder the terms in parentheses
135=+(+21x-12)
Remove unnecessary parentheses
+135=+21x-12
We move all terms containing x to the left and all other terms to the right.
-21x=-12-135
We simplify left and right side of the equation.
-21x=-147
We divide both sides of the equation by -021 to get x.
x=7
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