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18-9x-4x+4=-4
We simplify the equation to the form, which is simple to understand
18-9x-4x+4=-4
We move all terms containing x to the left and all other terms to the right.
-9x-4x=-4-18-4
We simplify left and right side of the equation.
-13x=-26
We divide both sides of the equation by -13 to get x.
x=2
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