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21+32u=36+27u
We move all terms to the left:
21+32u-(36+27u)=0
We add all the numbers together, and all the variables
32u-(27u+36)+21=0
We get rid of parentheses
32u-27u-36+21=0
We add all the numbers together, and all the variables
5u-15=0
We move all terms containing u to the left, all other terms to the right
5u=15
u=15/5
u=3
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