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5*x^2+16/4-23-12-5-4+3+5+10+15 = 0
5*x^2 = 7 // : 5
x^2 = 7/5
x^2 = 7/5 // ^ 1/2
abs(x) = (7/5)^(1/2)
x = (7/5)^(1/2) or x = -(7/5)^(1/2)
x in { (7/5)^(1/2), -(7/5)^(1/2) }
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