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-2x-x=15
We simplify the equation to the form, which is simple to understand
-2x-x=15
We move all terms containing x to the left and all other terms to the right.
-2x-1x=+15
We simplify left and right side of the equation.
-3x=+15
We divide both sides of the equation by -3 to get x.
x=-5
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