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4x+13+3x-8+5x-12=180
We move all terms to the left:
4x+13+3x-8+5x-12-(180)=0
We add all the numbers together, and all the variables
12x-187=0
We move all terms containing x to the left, all other terms to the right
12x=187
x=187/12
x=15+7/12
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