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42=2x-6x
We move all terms to the left:
42-(2x-6x)=0
We add all the numbers together, and all the variables
-(-4x)+42=0
We get rid of parentheses
4x+42=0
We move all terms containing x to the left, all other terms to the right
4x=-42
x=-42/4
x=-10+1/2
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