Question

Does anyone know -6/7+6/21

Answer 1

Simple...

you have:
`-(6)/(7) + (6)/(21)`

You must find a common denominator first-->>


`- (6)/(7) * (3)/(3) = -(18)/(21)`

Now...


`- (18)/(21) + (6)/(21) = -(12)/(21)`


`= -(12)/(21)`

Simplify it-->>
`-(4)/(7)`

Thus, your answer.