-21/2=r-4/5 - solution

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Solution for -21/2=r-4/5 equation:

r in (-oo:+oo)

-21/2 = r-(4/5) // - r-(4/5)

4/5-r-21/2 = 0

-r-97/10 = 0 // + 97/10

-r = 97/10 // * -1

r = -97/10

r = -97/10

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