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-9x=-13-4
We move all terms to the left:
-9x-(-13-4)=0
We add all the numbers together, and all the variables
-9x-(-17)=0
We add all the numbers together, and all the variables
-9x+17=0
We move all terms containing x to the left, all other terms to the right
-9x=-17
x=-17/-9
x=1+8/9
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