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((84*x^7)/12)*x^7+16*x^6 = 0
7*x^14+16*x^6 = 0
x^6*(7*x^8+16) = 0
7*x^8 = -16 // : 7
x^8 = -16/7
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x = 0
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