3+2u=-7

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Solution for 3+2u=-7 equation: 



3+2u=-7

We move all terms to the left:

3+2u-(-7)=0

We add all the numbers together, and all the variables

2u+10=0

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

2u=-10

u=-10/2

u=-5

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