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D( x )
x/2 <= 0
x/2 <= 0
x/2 <= 0
1/2*x+0 <= 0 // - 0
1/2*x <= 0 // : 1/2
x <= 0/1/2
x <= 0
x in (0:+oo)
log(x/2)(36) = 2 // - 2
log(x/2)(36)-2 = 0
log(x/2)(36)-2 = 0 // + 2
log(x/2)(36) = 2
log(x/2)(36) = log(x/2)((x/2)^2)
36 = (x/2)^2
36-(x/2)^2 = 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}
x = 12
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