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70=4u+6u
We move all terms to the left:
70-(4u+6u)=0
We add all the numbers together, and all the variables
-(+10u)+70=0
We get rid of parentheses
-10u+70=0
We move all terms containing u to the left, all other terms to the right
-10u=-70
u=-70/-10
u=+7
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