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3u-6=10u-69
We move all terms to the left:
3u-6-(10u-69)=0
We get rid of parentheses
3u-10u+69-6=0
We add all the numbers together, and all the variables
-7u+63=0
We move all terms containing u to the left, all other terms to the right
-7u=-63
u=-63/-7
u=+9
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