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-9x+5x-18=12
We simplify the equation to the form, which is simple to understand
-9x+5x-18=12
We move all terms containing x to the left and all other terms to the right.
-9x+5x=+12+18
We simplify left and right side of the equation.
-4x=+30
We divide both sides of the equation by -4 to get x.
x=-7.5
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