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2(4u+5)=70
We move all terms to the left:
2(4u+5)-(70)=0
We multiply parentheses
8u+10-70=0
We add all the numbers together, and all the variables
8u-60=0
We move all terms containing u to the left, all other terms to the right
8u=60
u=60/8
u=7+1/2
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