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2u+30=7u-15
We move all terms to the left:
2u+30-(7u-15)=0
We get rid of parentheses
2u-7u+15+30=0
We add all the numbers together, and all the variables
-5u+45=0
We move all terms containing u to the left, all other terms to the right
-5u=-45
u=-45/-5
u=+9
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