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8u+3=u+52
We move all terms to the left:
8u+3-(u+52)=0
We get rid of parentheses
8u-u-52+3=0
We add all the numbers together, and all the variables
7u-49=0
We move all terms containing u to the left, all other terms to the right
7u=49
u=49/7
u=7
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