15/20=i/40 - solution

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Solution for 15/20=i/40 equation:

i in (-oo:+oo)

15/20 = i/40 // - i/40

15/20-(i/40) = 0

3/4-1/40*i = 0 // - 3/4

-1/40*i = -3/4 // : -1/40

i = -3/4/(-1/40)

i = 30

i = 30

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