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120+9x=-3x-120
We simplify the equation to the form, which is simple to understand
120+9x=-3x-120
We move all terms containing x to the left and all other terms to the right.
+9x+3x=-120-120
We simplify left and right side of the equation.
+12x=-240
We divide both sides of the equation by 12 to get x.
x=-20
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