-6.9=-2.1+u/3

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Solution for -6.9=-2.1+u/3 equation: 



-6.9=-2.1+u/3

We move all terms to the left:

-6.9-(-2.1+u/3)=0

We add all the numbers together, and all the variables

-(u/3-2.1)-6.9=0

We get rid of parentheses

-u/3+2.1-6.9=0

We multiply all the terms by the denominator


-u+(2.1)*3-(6.9)*3=0

We add all the numbers together, and all the variables

-1u-14.4=0

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

-u=14.4

u=14.4/-1

u=-14+0.4/1

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