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21x+31=17+49
We move all terms to the left:
21x+31-(17+49)=0
We add all the numbers together, and all the variables
21x+31-66=0
We add all the numbers together, and all the variables
21x-35=0
We move all terms containing x to the left, all other terms to the right
21x=35
x=35/21
x=1+2/3
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