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x in (-oo:+oo)
36 = (90/360)*x*x // - (90/360)*x*x
36-((90/360)*x*x) = 0
(-1/4)*x^2+36 = 0
-1/4*x^2 = -36 // : -1/4
x^2 = 144
x^2 = 144 // ^ 1/2
abs(x) = 12
x = 12 or x = -12
x in { 12, -12 }
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