-4+r/20-5 - solution

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

r in (-oo:+oo)

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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