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2/5-(((3*x)/8)*x) = -11/10 // + -11/10
2/5-(((3*x)/8)*x)-(-11/10) = 0
(-3/8)*x^2+2/5+11/10 = 0
-3/8*x^2 = -3/2 // : -3/8
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in { 2, -2 }
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