4/5-9/4=r - solution

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Solution for 4/5-9/4=r equation:

r in (-oo:+oo)

4/5-(9/4) = r // - r

4/5-r-(9/4) = 0

4/5-r-9/4 = 0

-r-29/20 = 0 // + 29/20

-r = 29/20 // * -1

r = -29/20

r = -29/20

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