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a in (-oo:+oo)
(1/2)*a+4/5 = 37/40 // - 37/40
(1/2)*a+4/5-(37/40) = 0
(1/2)*a+4/5-37/40 = 0
1/2*a-1/8 = 0 // + 1/8
1/2*a = 1/8 // : 1/2
a = 1/8/1/2
a = 1/4
a = 1/4
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