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9x-12-7x-7=-15
We simplify the equation to the form, which is simple to understand
9x-12-7x-7=-15
We move all terms containing x to the left and all other terms to the right.
+9x-7x=-15+12+7
We simplify left and right side of the equation.
+2x=+4
We divide both sides of the equation by 2 to get x.
x=2
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