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-7x+2x-12=9x+1
We move all terms to the left:
-7x+2x-12-(9x+1)=0
We add all the numbers together, and all the variables
-5x-(9x+1)-12=0
We get rid of parentheses
-5x-9x-1-12=0
We add all the numbers together, and all the variables
-14x-13=0
We move all terms containing x to the left, all other terms to the right
-14x=13
x=13/-14
x=-13/14
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