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90-7x=9+12x+24
We simplify the equation to the form, which is simple to understand
90-7x=9+12x+24
We move all terms containing x to the left and all other terms to the right.
-7x-12x=+9+24-90
We simplify left and right side of the equation.
-19x=-57
We divide both sides of the equation by -19 to get x.
x=3
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