3(u+21)=87

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Solution for 3(u+21)=87 equation: 



3(u+21)=87

We move all terms to the left:

3(u+21)-(87)=0

We multiply parentheses

3u+63-87=0

We add all the numbers together, and all the variables

3u-24=0

We move all terms containing u to the left, all other terms to the right

3u=24

u=24/3

u=8

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