64=1-9u

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Solution for 64=1-9u equation: 



64=1-9u

We move all terms to the left:

64-(1-9u)=0

We add all the numbers together, and all the variables

-(-9u+1)+64=0

We get rid of parentheses

9u-1+64=0

We add all the numbers together, and all the variables

9u+63=0

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

9u=-63

u=-63/9

u=-7

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