3/40=3r/8

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Solution for 3/40=3r/8 equation: 


r in (-oo:+oo)

3/40 = (3*r)/8 // - (3*r)/8

3/40-((3*r)/8) = 0

(-3/8)*r+3/40 = 0

3/40-3/8*r = 0 // - 3/40

-3/8*r = -3/40 // : -3/8

r = -3/40/(-3/8)

r = 1/5

r = 1/5

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