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3x-2+4x+x+12=66
We simplify the equation to the form, which is simple to understand
3x-2+4x+x+12=66
We move all terms containing x to the left and all other terms to the right.
+3x+4x+1x=+66+2-12
We simplify left and right side of the equation.
+8x=+56
We divide both sides of the equation by 8 to get x.
x=7
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