171=240-u

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Solution for 171=240-u equation: 



171=240-u

We move all terms to the left:

171-(240-u)=0

We add all the numbers together, and all the variables

-(-1u+240)+171=0

We get rid of parentheses

1u-240+171=0

We add all the numbers together, and all the variables

u-69=0

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

u=69

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