7/10d=21 - solution

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Solution for 7/10d=21 equation:

d in (-oo:+oo)

(7/10)*d = 21 // - 21

(7/10)*d-21 = 0

7/10*d-21 = 0 // + 21

7/10*d = 21 // : 7/10

d = 21/7/10

d = 30

d = 30

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