21z^7-15z^3/3z^3

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Solution for 21z^7-15z^3/3z^3 equation: 


z in (-oo:+oo)

21*z^7-(((15*z^3)/3)*z^3) = 0

21*z^7-5*z^6 = 0

21*z^7-5*z^6 = 0

z^6*(21*z-5) = 0

21*z-5 = 0 // + 5

21*z = 5 // : 21

z = 5/21

z^6 = 0

1*z^6 = 0 // : 1

z^6 = 0

z = 0

z in { 5/21, 0 }

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