7u+2u-4u=20

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Solution for 7u+2u-4u=20 equation: 



7u+2u-4u=20

We move all terms to the left:

7u+2u-4u-(20)=0

We add all the numbers together, and all the variables

5u-20=0

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

5u=20

u=20/5

u=4

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