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3x-19+2x+20+7x-13=180
We move all terms to the left:
3x-19+2x+20+7x-13-(180)=0
We add all the numbers together, and all the variables
12x-192=0
We move all terms containing x to the left, all other terms to the right
12x=192
x=192/12
x=16
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