6+7u=20

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Solution for 6+7u=20 equation: 



6+7u=20

We move all terms to the left:

6+7u-(20)=0

We add all the numbers together, and all the variables

7u-14=0

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

7u=14

u=14/7

u=2

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