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x+7+x+2+x=0
We simplify the equation to the form, which is simple to understand
x+7+x+2+x=0
We move all terms containing x to the left and all other terms to the right.
+1x+1x+1x=0-7-2
We simplify left and right side of the equation.
+3x=-9
We divide both sides of the equation by 3 to get x.
x=-3
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