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3x-20.x-9.x-1=180
We move all terms to the left:
3x-20.x-9.x-1-(180)=0
We add all the numbers together, and all the variables
-26x-181=0
We move all terms containing x to the left, all other terms to the right
-26x=181
x=181/-26
x=-6+25/26
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