4/5r-5=-15 - solution

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Solution for 4/5r-5=-15 equation:

r in (-oo:+oo)

(4/5)*r-5 = -15 // + 15

(4/5)*r-5+15 = 0

4/5*r+10 = 0 // - 10

4/5*r = -10 // : 4/5

r = -10/4/5

r = -25/2

r = -25/2

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