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x in (-oo:+oo)
1/2-((5/2)*x) = -18 // + 18
1/2-((5/2)*x)+18 = 0
(-5/2)*x+1/2+18 = 0
37/2-5/2*x = 0 // - 37/2
-5/2*x = -37/2 // : -5/2
x = -37/2/(-5/2)
x = 37/5
x = 37/5
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