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21u-36=-10u-4
We move all terms to the left:
21u-36-(-10u-4)=0
We get rid of parentheses
21u+10u+4-36=0
We add all the numbers together, and all the variables
31u-32=0
We move all terms containing u to the left, all other terms to the right
31u=32
u=32/31
u=1+1/31
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