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84+12x+48=0
We simplify the equation to the form, which is simple to understand
84+12x+48=0
We move all terms containing x to the left and all other terms to the right.
+12x=0-84-48
We simplify left and right side of the equation.
+12x=-132
We divide both sides of the equation by 12 to get x.
x=-11
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