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12+x=6x-3
We simplify the equation to the form, which is simple to understand
12+x=6x-3
We move all terms containing x to the left and all other terms to the right.
+1x-6x=-3-12
We simplify left and right side of the equation.
-5x=-15
We divide both sides of the equation by -5 to get x.
x=3
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