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-7x+12-2x=23+13
We move all terms to the left:
-7x+12-2x-(23+13)=0
We add all the numbers together, and all the variables
-7x-2x+12-36=0
We add all the numbers together, and all the variables
-9x-24=0
We move all terms containing x to the left, all other terms to the right
-9x=24
x=24/-9
x=-2+2/3
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