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3x+4+6x-8+7x-20=180
We move all terms to the left:
3x+4+6x-8+7x-20-(180)=0
We add all the numbers together, and all the variables
16x-204=0
We move all terms containing x to the left, all other terms to the right
16x=204
x=204/16
x=12+3/4
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