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-7x-(-9x+2)=22
We move all terms to the left:
-7x-(-9x+2)-(22)=0
We get rid of parentheses
-7x+9x-2-22=0
We add all the numbers together, and all the variables
2x-24=0
We move all terms containing x to the left, all other terms to the right
2x=24
x=24/2
x=12
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