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3x+(-x)-(-3x)=0
We simplify the equation to the form, which is simple to understand
3x+(-x)-(-3x)=0
Remove unnecessary parentheses
+3x-x-(-3x+)=0
Remove unnecessary parentheses
3x-x+3x=0
We move all terms containing x to the left and all other terms to the right.
+3x-1x+3x=0
We simplify left and right side of the equation.
+5x=0
We divide both sides of the equation by 5 to get x.
x=0
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