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2x+(5x-7)=7
We move all terms to the left:
2x+(5x-7)-(7)=0
We get rid of parentheses
2x+5x-7-7=0
We add all the numbers together, and all the variables
7x-14=0
We move all terms containing x to the left, all other terms to the right
7x=14
x=14/7
x=2
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