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(1/2)*x^2-36 = 0
1/2*x^2 = 36 // : 1/2
x^2 = 72
x^2 = 72 // ^ 1/2
abs(x) = 6*2^(1/2)
x = 6*2^(1/2) or x = -(6*2^(1/2))
x in { 6*2^(1/2), -(6*2^(1/2)) }
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