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-12x-18=-9x
We simplify the equation to the form, which is simple to understand
-12x-18=-9x
We move all terms containing x to the left and all other terms to the right.
-12x+9x=+18
We simplify left and right side of the equation.
-3x=+18
We divide both sides of the equation by -3 to get x.
x=-6
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