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17x-21=51-9x
We move all terms to the left:
17x-21-(51-9x)=0
We add all the numbers together, and all the variables
17x-(-9x+51)-21=0
We get rid of parentheses
17x+9x-51-21=0
We add all the numbers together, and all the variables
26x-72=0
We move all terms containing x to the left, all other terms to the right
26x=72
x=72/26
x=2+10/13
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