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5x+20+7x-19+3x-1=180
We move all terms to the left:
5x+20+7x-19+3x-1-(180)=0
We add all the numbers together, and all the variables
15x-180=0
We move all terms containing x to the left, all other terms to the right
15x=180
x=180/15
x=12
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