x21=(-2/3)*20+5

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Solution for x21=(-2/3)*20+5 equation: 


x in (-oo:+oo)

x^21 = 20*(-2/3)+5 // - 20*(-2/3)+5

x^21-(20*(-2/3))-5 = 0

x^21+40/3-5 = 0

1*x^21 = -25/3 // : 1

x^21 = -25/3

x^21 = -25/3 // ^ 1/21

x = -(25/3)^(1/21)

x = -(25/3)^(1/21)

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