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2x+8+x+12+2x+8+x+12=18x-20
We simplify the equation to the form, which is simple to understand
2x+8+x+12+2x+8+x+12=18x-20
We move all terms containing x to the left and all other terms to the right.
+2x+1x+2x+1x-18x=-20-8-12-8-12
We simplify left and right side of the equation.
-12x=-60
We divide both sides of the equation by -12 to get x.
x=5
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