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70=5u+10
We move all terms to the left:
70-(5u+10)=0
We get rid of parentheses
-5u-10+70=0
We add all the numbers together, and all the variables
-5u+60=0
We move all terms containing u to the left, all other terms to the right
-5u=-60
u=-60/-5
u=+12
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