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((7/10)*x^4)/5 = 3*x // - 3*x
((7/10)*x^4)/5-(3*x) = 0
((7/10)*x^4)/5-3*x = 0
7/50*x^4-3*x = 0
x*(7/50*x^3-3) = 0
7/50*x^3 = 3 // : 7/50
x^3 = 150/7
x^3 = 150/7 // ^ 1/3
x = (150/7)^(1/3)
x = 0
x = 0
x in { (150/7)^(1/3), 0 }
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