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5.x-2+8.x-1+6.x+12=180
We move all terms to the left:
5.x-2+8.x-1+6.x+12-(180)=0
We add all the numbers together, and all the variables
19x-171=0
We move all terms containing x to the left, all other terms to the right
19x=171
x=171/19
x=9
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