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4x+31+5x+6+12x-4=180
We move all terms to the left:
4x+31+5x+6+12x-4-(180)=0
We add all the numbers together, and all the variables
21x-147=0
We move all terms containing x to the left, all other terms to the right
21x=147
x=147/21
x=7
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