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(1/5)*X^2*x-10+4 = 0
1/5*X^2*x-6 = 0 // + 6
1/5*X^2*x = 6 // : 1/5*X^2
x = 6/(1/5*X^2)
x = 30*X^-2
x = 30*X^-2
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