-4=r/20+5

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Solution for -4=r/20+5 equation: 


r in (-oo:+oo)

-4 = r/20+5 // - r/20+5

-(r/20)-5-4 = 0

-1/20*r-9 = 0 // + 9

-1/20*r = 9 // : -1/20

r = 9/(-1/20)

r = -180

r = -180

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