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