4=r/20-5 - solution

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Solution for 4=r/20-5 equation:

r in (-oo:+oo)

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

4-(r/20)+5 = 0

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

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

r = -9/(-1/20)

r = 180

r = 180

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