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u/8+-21=-22
We move all terms to the left:
u/8+-21-(-22)=0
We add all the numbers together, and all the variables
u/8+1=0
We multiply all the terms by the denominator
u+1*8=0
We add all the numbers together, and all the variables
u+8=0
We move all terms containing u to the left, all other terms to the right
u=-8
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