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7x+4-3x=x+25
We move all terms to the left:
7x+4-3x-(x+25)=0
We add all the numbers together, and all the variables
4x-(x+25)+4=0
We get rid of parentheses
4x-x-25+4=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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