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D( x )
x/4 <= 0
x/4 <= 0
x/4 <= 0
1/4*x+0 <= 0 // - 0
1/4*x <= 0 // : 1/4
x <= 0/1/4
x <= 0
x in (0:+oo)
log(x/4)(36) = 2 // - 2
log(x/4)(36)-2 = 0
log(x/4)(36)-2 = 0 // + 2
log(x/4)(36) = 2
log(x/4)(36) = log(x/4)((x/4)^2)
36 = (x/4)^2
36-(x/4)^2 = 0
-1*x^2 = -36 // : -1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { -6}
x = 6
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