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-(2x+5)+7x=-50
We move all terms to the left:
-(2x+5)+7x-(-50)=0
We add all the numbers together, and all the variables
7x-(2x+5)+50=0
We get rid of parentheses
7x-2x-5+50=0
We add all the numbers together, and all the variables
5x+45=0
We move all terms containing x to the left, all other terms to the right
5x=-45
x=-45/5
x=-9
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