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x in (-oo:+oo)
5-(x/(-2)) = 3*x // - 3*x
5-(x/(-2))-(3*x) = 0
5-(x/(-2))-3*x = 0
5-5/2*x = 0 // - 5
-5/2*x = -5 // : -5/2
x = -5/(-5/2)
x = 2
x = 2
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