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0.000045 = (4*x^3)/0.77 // - (4*x^3)/0.77
0.000045-((4*x^3)/0.77) = 0
0.000045-5.19480519*x^3 = 0
-5.19480519*x^3 = -0.000045 // : -5.19480519
x^3 = 0.00000866
x^3 = 0.00000866 // ^ 1/3
x = 0.00000866^(1/3)
x = 0.00000866^(1/3)
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