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x+3x+18=0
We simplify the equation to the form, which is simple to understand
x+3x+18=0
We move all terms containing x to the left and all other terms to the right.
+1x+3x=0-18
We simplify left and right side of the equation.
+4x=-18
We divide both sides of the equation by 4 to get x.
x=-4.5
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