4+1/5r=-1 - solution

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

r in (-oo:+oo)

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

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

1/5*r+5 = 0 // - 5

1/5*r = -5 // : 1/5

r = -5/1/5

r = -25

r = -25

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