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5x+6+12x-4+4x-31=180
We move all terms to the left:
5x+6+12x-4+4x-31-(180)=0
We add all the numbers together, and all the variables
21x-209=0
We move all terms containing x to the left, all other terms to the right
21x=209
x=209/21
x=9+20/21
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