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3x+7x=3(3x-1)+3
We simplify the equation to the form, which is simple to understand
3x+7x=3(3x-1)+3
Reorder the terms in parentheses
3x+7x=+(+9x-3)+3
Remove unnecessary parentheses
+3x+7x=+9x-3+3
We move all terms containing x to the left and all other terms to the right.
+3x+7x-9x=-3+3
We simplify left and right side of the equation.
+1x=0
We divide both sides of the equation by 1 to get x.
x=0
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