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3x+6x-(7x+7)=0
We simplify the equation to the form, which is simple to understand
3x+6x-(7x+7)=0
Remove unnecessary parentheses
3x+6x-7x-7=0
We move all terms containing x to the left and all other terms to the right.
+3x+6x-7x=0+7
We simplify left and right side of the equation.
+2x=+7
We divide both sides of the equation by 2 to get x.
x=3.5
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