1.9=r/0.4

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Solution for 1.9=r/0.4 equation: 


r in (-oo:+oo)

1.9 = r/0.4 // - r/0.4

1.9-(r/0.4) = 0

1.9-2.5*r = 0

1.9-2.5*r = 0 // - 1.9

-2.5*r = -1.9 // : -2.5

r = -1.9/(-2.5)

r = 0.76

r = 0.76

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