21/12=d/20 - solution

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Solution for 21/12=d/20 equation:

d in (-oo:+oo)

21/12 = d/20 // - d/20

21/12-(d/20) = 0

7/4-1/20*d = 0 // - 7/4

-1/20*d = -7/4 // : -1/20

d = -7/4/(-1/20)

d = 35

d = 35

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