-4=1/20r-5

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Solution for -4=1/20r-5 equation: 


r in (-oo:+oo)

-4 = (1/20)*r-5 // - (1/20)*r-5

5-((1/20)*r)-4 = 0

(-1/20)*r-4+5 = 0

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

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

r = -1/(-1/20)

r = 20

r = 20

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