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42-7x=24-x
We move all terms to the left:
42-7x-(24-x)=0
We add all the numbers together, and all the variables
-7x-(-1x+24)+42=0
We get rid of parentheses
-7x+1x-24+42=0
We add all the numbers together, and all the variables
-6x+18=0
We move all terms containing x to the left, all other terms to the right
-6x=-18
x=-18/-6
x=+3
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