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6*h*x+h*((h^2)/5) = 0
6*h*x+1/5*h^3 = 0 // - 1/5*h^3
6*h*x = -(1/5*h^3) // : 6*h
x = (-(1/5*h^3))/(6*h)
x = -1/30*h^2
x = -1/30*h^2
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