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