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8(u+2)=5u+31
We move all terms to the left:
8(u+2)-(5u+31)=0
We multiply parentheses
8u-(5u+31)+16=0
We get rid of parentheses
8u-5u-31+16=0
We add all the numbers together, and all the variables
3u-15=0
We move all terms containing u to the left, all other terms to the right
3u=15
u=15/3
u=5
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