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17x-21=2x+19
We move all terms to the left:
17x-21-(2x+19)=0
We get rid of parentheses
17x-2x-19-21=0
We add all the numbers together, and all the variables
15x-40=0
We move all terms containing x to the left, all other terms to the right
15x=40
x=40/15
x=2+2/3
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