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2x-2x-1+2x-3=20
We simplify the equation to the form, which is simple to understand
2x-2x-1+2x-3=20
We move all terms containing x to the left and all other terms to the right.
+2x-2x+2x=+20+1+3
We simplify left and right side of the equation.
+2x=+24
We divide both sides of the equation by 2 to get x.
x=12
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