r-4/5=21/4 - solution

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

r in (-oo:+oo)

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

r-(4/5)-(21/4) = 0

r-4/5-21/4 = 0

r-121/20 = 0 // + 121/20

r = 121/20

r = 121/20

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