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4+3x-x=12
We simplify the equation to the form, which is simple to understand
4+3x-x=12
We move all terms containing x to the left and all other terms to the right.
+3x-1x=+12-4
We simplify left and right side of the equation.
+2x=+8
We divide both sides of the equation by 2 to get x.
x=4
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