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4x+9+2x+22+7x+12=0
We simplify the equation to the form, which is simple to understand
4x+9+2x+22+7x+12=0
We move all terms containing x to the left and all other terms to the right.
+4x+2x+7x=0-9-22-12
We simplify left and right side of the equation.
+13x=-43
We divide both sides of the equation by 13 to get x.
x=-3.3076923076923
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