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(X^2)/10+(9*x)/10+11/5 = 0
1/10*X^2+9/10*x+11/5 = 0 // - 1/10*X^2+11/5
9/10*x = -(1/10*X^2+11/5) // : 9/10
x = (-(1/10*X^2+11/5))/9/10
x = -10/9*(1/10*X^2+11/5)
x = -10/9*(1/10*X^2+11/5)
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