5u+4u=90

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Solution for 5u+4u=90 equation: 



5u+4u=90

We move all terms to the left:

5u+4u-(90)=0

We add all the numbers together, and all the variables

9u-90=0

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

9u=90

u=90/9

u=10

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