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2x-12-9x=-9
We simplify the equation to the form, which is simple to understand
2x-12-9x=-9
We move all terms containing x to the left and all other terms to the right.
+2x-9x=-9+12
We simplify left and right side of the equation.
-7x=+3
We divide both sides of the equation by -7 to get x.
x=-0.428571428571
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