7u+-9u=-4

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Solution for 7u+-9u=-4 equation: 



7u+-9u=-4

We move all terms to the left:

7u+-9u-(-4)=0

We add all the numbers together, and all the variables

-2u+4=0

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

-2u=-4

u=-4/-2

u=+2

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