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16x-17=20x-91
We move all terms to the left:
16x-17-(20x-91)=0
We get rid of parentheses
16x-20x+91-17=0
We add all the numbers together, and all the variables
-4x+74=0
We move all terms containing x to the left, all other terms to the right
-4x=-74
x=-74/-4
x=18+1/2
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