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7x-48=2x+57
We move all terms to the left:
7x-48-(2x+57)=0
We get rid of parentheses
7x-2x-57-48=0
We add all the numbers together, and all the variables
5x-105=0
We move all terms containing x to the left, all other terms to the right
5x=105
x=105/5
x=21
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