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10x-(5x-2)=7
We move all terms to the left:
10x-(5x-2)-(7)=0
We get rid of parentheses
10x-5x+2-7=0
We add all the numbers together, and all the variables
5x-5=0
We move all terms containing x to the left, all other terms to the right
5x=5
x=5/5
x=1
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