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a in (-oo:+oo)
-18 = (9-a)/2 // - (9-a)/2
-((9-a)/2)-18 = 0
(-1*(9-a))/2-18 = 0
(-1*(9-a))/2+(-18*2)/2 = 0
-1*(9-a)-18*2 = 0
a-45 = 0
(a-45)/2 = 0
(a-45)/2 = 0 // * 2
a-45 = 0
a-45 = 0 // + 45
a = 45
a = 45
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