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-17-8x=139+4x
We move all terms to the left:
-17-8x-(139+4x)=0
We add all the numbers together, and all the variables
-8x-(4x+139)-17=0
We get rid of parentheses
-8x-4x-139-17=0
We add all the numbers together, and all the variables
-12x-156=0
We move all terms containing x to the left, all other terms to the right
-12x=156
x=156/-12
x=-13
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