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10=7u+5u
We move all terms to the left:
10-(7u+5u)=0
We add all the numbers together, and all the variables
-(+12u)+10=0
We get rid of parentheses
-12u+10=0
We move all terms containing u to the left, all other terms to the right
-12u=-10
u=-10/-12
u=5/6
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