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x in (-oo:+oo)
(x-18)/2 = 5*x // - 5*x
(x-18)/2-(5*x) = 0
(x-18)/2-5*x = 0
(x-18)/2+(-5*2*x)/2 = 0
x-5*2*x-18 = 0
-9*x-18 = 0
(-9*x-18)/2 = 0
(-9*x-18)/2 = 0 // * 2
-9*x-18 = 0
-9*x-18 = 0 // + 18
-9*x = 18 // : -9
x = 18/(-9)
x = -2
x = -2
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