4u+7=91

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Solution for 4u+7=91 equation: 



4u+7=91

We move all terms to the left:

4u+7-(91)=0

We add all the numbers together, and all the variables

4u-84=0

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

4u=84

u=84/4

u=21

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