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2x-(7x-3)=9
We move all terms to the left:
2x-(7x-3)-(9)=0
We get rid of parentheses
2x-7x+3-9=0
We add all the numbers together, and all the variables
-5x-6=0
We move all terms containing x to the left, all other terms to the right
-5x=6
x=6/-5
x=-1+1/5
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