21/4r=10 - solution

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Solution for 21/4r=10 equation:

r in (-oo:+oo)

(21/4)*r = 10 // - 10

(21/4)*r-10 = 0

21/4*r-10 = 0 // + 10

21/4*r = 10 // : 21/4

r = 10/21/4

r = 40/21

r = 40/21

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