15.8=r/2.5+17

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Solution for 15.8=r/2.5+17 equation: 


r in (-oo:+oo)

15.8 = r/2.5+17 // - r/2.5+17

15.8-(r/2.5)-17 = 0

15.8-0.4*r-17 = 0

-0.4*r-1.2 = 0 // + 1.2

-0.4*r = 1.2 // : -0.4

r = 1.2/(-0.4)

r = -3

r = -3

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