-21/4=r-4/5 - solution

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Solution for -21/4=r-4/5 equation:

r in (-oo:+oo)

-21/4 = r-(4/5) // - r-(4/5)

4/5-r-21/4 = 0

-r-89/20 = 0 // + 89/20

-r = 89/20 // * -1

r = -89/20

r = -89/20

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