4=2/5r-8

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Solution for 4=2/5r-8 equation: 


r in (-oo:+oo)

4 = (2/5)*r-8 // - (2/5)*r-8

4-((2/5)*r)+8 = 0

(-2/5)*r+4+8 = 0

12-2/5*r = 0 // - 12

-2/5*r = -12 // : -2/5

r = -12/(-2/5)

r = 30

r = 30

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