9u+19=7u+31

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Solution for 9u+19=7u+31 equation: 



9u+19=7u+31

We move all terms to the left:

9u+19-(7u+31)=0

We get rid of parentheses

9u-7u-31+19=0

We add all the numbers together, and all the variables

2u-12=0

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

2u=12

u=12/2

u=6

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