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(-2/5)*x-((9*x^9)/10) = 0
(-9/10)*x^9+(-2/5)*x = 0
-9/10*x^9-2/5*x = 0
-1/5*x*(9/2*x^8+2) = 0
9/2*x^8 = -2 // : 9/2
x^8 = -4/9
-x/5 = 0
-1/5*x = 0 // : -1/5
x = 0
x = 0
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