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7x-(-2x)=0
We simplify the equation to the form, which is simple to understand
7x-(-2x)=0
Remove unnecessary parentheses
7x+2x=0
We move all terms containing x to the left and all other terms to the right.
+7x+2x=0
We simplify left and right side of the equation.
+9x=0
We divide both sides of the equation by 9 to get x.
x=0
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