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36-((10*x^2)/5)-11 = 0
36-2*x^2-11 = 0
-2*x^2 = -25 // : -2
x^2 = 25/2
x^2 = 25/2 // ^ 1/2
abs(x) = (25/2)^(1/2)
x = (25/2)^(1/2) or x = -(25/2)^(1/2)
x in { (25/2)^(1/2), -(25/2)^(1/2) }
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