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x-((3/15)*x*x^6)-((18/5)*x) = 0
(-1/5)*x^7+x+(-18/5)*x = 0
-1/5*x^7-13/5*x = 0
-1/5*x*(x^6+13) = 0
1*x^6 = -13 // : 1
x^6 = -13
-x/5 = 0
-1/5*x = 0 // : -1/5
x = 0
x = 0
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