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-(7x-3)=7x+15
We move all terms to the left:
-(7x-3)-(7x+15)=0
We get rid of parentheses
-7x-7x+3-15=0
We add all the numbers together, and all the variables
-14x-12=0
We move all terms containing x to the left, all other terms to the right
-14x=12
x=12/-14
x=-6/7
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