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12x+9=5x-5
We simplify the equation to the form, which is simple to understand
12x+9=5x-5
We move all terms containing x to the left and all other terms to the right.
+12x-5x=-5-9
We simplify left and right side of the equation.
+7x=-14
We divide both sides of the equation by 7 to get x.
x=-2
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