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3x+12-9x=12-2x
We simplify the equation to the form, which is simple to understand
3x+12-9x=12-2x
We move all terms containing x to the left and all other terms to the right.
+3x-9x+2x=+12-12
We simplify left and right side of the equation.
-4x=0
We divide both sides of the equation by -4 to get x.
x=-0
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