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x in (-oo:+oo)
(6/5)*(5-(10*x)) = -18 // + 18
(6/5)*(5-(10*x))+18 = 0
(6/5)*(5-10*x)+18 = 0
6/5*(5-10*x)+18 = 0
6/5*(5-10*x)+18 = 0
24-12*x = 0
24-12*x = 0
24-12*x = 0 // - 24
-12*x = -24 // : -12
x = -24/(-12)
x = 2
x = 2
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