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a in (-oo:+oo)
(a-7.3)/4.5 = 2.4 // - 2.4
(a-7.3)/4.5-2.4 = 0
(a-7.3)/4.5+(-2.4*4.5)/4.5 = 0
a-2.4*4.5-7.3 = 0
a-18.1 = 0
(a-18.1)/4.5 = 0
(a-18.1)/4.5 = 0 // * 4.5
a-18.1 = 0
a-18.1 = 0 // + 18.1
a = 18.1
a = 18.1
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