-36+21u=-28

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Solution for -36+21u=-28 equation: 



-36+21u=-28

We move all terms to the left:

-36+21u-(-28)=0

We add all the numbers together, and all the variables

21u-8=0

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

21u=8

u=8/21

u=8/21

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