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x in (-oo:+oo)
(15*Q)/Z = (x+5)/5 // - (x+5)/5
(15*Q)/Z-((x+5)/5) = 0
(-1*(x+5))/5+(15*Q)/Z = 0
(-1*Z*(x+5))/(5*Z)+(5*15*Q)/(5*Z) = 0
5*15*Q-1*Z*(x+5) = 0
75*Q-5*Z-(Z*x) = 0
(75*Q-5*Z-(Z*x))/(5*Z) = 0
(75*Q-5*Z-(Z*x))/(5*Z) = 0 // * 5*Z
75*Q-5*Z-(Z*x) = 0
75*Q-5*Z-Z*x = 0 // - 75*Q-5*Z
-Z*x = -(75*Q-5*Z) // : -Z
x = (-(75*Q-5*Z))/(-Z)
x = (75*Q-5*Z)/Z
x = (75*Q-5*Z)/Z
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