20u-13u+5u-7u=15

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Solution for 20u-13u+5u-7u=15 equation: 



20u-13u+5u-7u=15

We move all terms to the left:

20u-13u+5u-7u-(15)=0

We add all the numbers together, and all the variables

5u-15=0

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

5u=15

u=15/5

u=3

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