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x+2x+6=0
We simplify the equation to the form, which is simple to understand
x+2x+6=0
We move all terms containing x to the left and all other terms to the right.
+1x+2x=0-6
We simplify left and right side of the equation.
+3x=-6
We divide both sides of the equation by 3 to get x.
x=-2
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