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a in (-oo:+oo)
(2*a-9)/5+3 = 2*a // - 2*a
(2*a-9)/5-(2*a)+3 = 0
(2*a-9)/5-2*a+3 = 0
(2*a-9)/5+(-2*5*a)/5+(3*5)/5 = 0
2*a-2*5*a+3*5-9 = 0
15-8*a-9 = 0
6-8*a = 0
(6-8*a)/5 = 0
(6-8*a)/5 = 0 // * 5
6-8*a = 0
6-8*a = 0 // - 6
-8*a = -6 // : -8
a = -6/(-8)
a = 3/4
a = 3/4
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