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42+40x=67+20x
We move all terms to the left:
42+40x-(67+20x)=0
We add all the numbers together, and all the variables
40x-(20x+67)+42=0
We get rid of parentheses
40x-20x-67+42=0
We add all the numbers together, and all the variables
20x-25=0
We move all terms containing x to the left, all other terms to the right
20x=25
x=25/20
x=1+1/4
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