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x in (-oo:+oo)
(1/2)*(9-((18/2)*x)) = 5 // - 5
(1/2)*(9-((18/2)*x))-5 = 0
(1/2)*(9-9*x)-5 = 0
1/2*(9-9*x)-5 = 0
1/2*(9-9*x)-5 = 0
-9/2*x-1/2 = 0
-9/2*x-1/2 = 0
-9/2*x-1/2 = 0 // + 1/2
-9/2*x = 1/2 // : -9/2
x = 1/2/(-9/2)
x = -1/9
x = -1/9
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