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2/3-(((3/7)*x^21)/15) = 0
(-1/35)*x^21+2/3 = 0
-1/35*x^21 = -2/3 // : -1/35
x^21 = 70/3
x^21 = 70/3 // ^ 1/21
x = (70/3)^(1/21)
x = (70/3)^(1/21)
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