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15*x^7*((2/3)*x-3) = 0
15*x^7*(2/3*x-3) = 0
( 15*x^7 )
15*x^7 = 0 // : 15
x^7 = 0
x = 0
( 2/3*x-3 )
2/3*x-3 = 0 // + 3
2/3*x = 3 // : 2/3
x = 3/2/3
x = 9/2
x in { 0, 9/2 }
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