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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(25)(x/2) = 1/2 // - 1/2
log(25)(x/2)-(1/2) = 0
log(25)(x/2)-1/2 = 0
log(25)(x/2)-1/2 = 0 // + 1/2
log(25)(x/2) = 1/2
log(25)(x/2) = log(25)(25^(1/2))
x/2 = 25^(1/2)
x/2-25^(1/2) = 0
1/2*x-5 = 0 // + 5
1/2*x = 5 // : 1/2
x = 5/1/2
x = 10
x = 10
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