21=1-x/5

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Solution for 21=1-x/5 equation: 


x in (-oo:+oo)

21 = 1-(x/5) // - 1-(x/5)

x/5-1+21 = 0

1/5*x+20 = 0 // - 20

1/5*x = -20 // : 1/5

x = -20/1/5

x = -100

x = -100

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