5-(-2u)=6.4

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Solution for 5-(-2u)=6.4 equation: 



5-(-2u)=6.4

We move all terms to the left:

5-(-2u)-(6.4)=0

We add all the numbers together, and all the variables

-(-2u)-1.4=0

We get rid of parentheses

2u-1.4=0

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

2u=1.4

u=1.4/2

u=1/1.4285714285714

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