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20x+2+16x+1+9x-3=180
We move all terms to the left:
20x+2+16x+1+9x-3-(180)=0
We add all the numbers together, and all the variables
45x-180=0
We move all terms containing x to the left, all other terms to the right
45x=180
x=180/45
x=4
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