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7x-42=3x+48
We move all terms to the left:
7x-42-(3x+48)=0
We get rid of parentheses
7x-3x-48-42=0
We add all the numbers together, and all the variables
4x-90=0
We move all terms containing x to the left, all other terms to the right
4x=90
x=90/4
x=22+1/2
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