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12=6x+3x+3
We simplify the equation to the form, which is simple to understand
12=6x+3x+3
We move all terms containing x to the left and all other terms to the right.
-6x-3x=+3-12
We simplify left and right side of the equation.
-9x=-9
We divide both sides of the equation by -9 to get x.
x=1
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