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12x+2+12x-3+13x-4=180
We move all terms to the left:
12x+2+12x-3+13x-4-(180)=0
We add all the numbers together, and all the variables
37x-185=0
We move all terms containing x to the left, all other terms to the right
37x=185
x=185/37
x=5
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