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a in (-oo:+oo)
(1/4)*(18-a) = 9.5 // - 9.5
(1/4)*(18-a)-9.5 = 0
1/4*(18-a)-9.5 = 0
1/4*(18-a)-9.5 = 0
-1/4*a-5 = 0
-1/4*a-5 = 0
-1/4*a-5 = 0 // + 5
-1/4*a = 5 // : -1/4
a = 5/(-1/4)
a = -20
a = -20
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