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a in (-oo:+oo)
3/5-(a/2) = 1/4-2 // - 1/4-2
3/5-(a/2)-(1/4)+2 = 0
3/5-(a/2)-1/4+2 = 0
47/20-1/2*a = 0 // - 47/20
-1/2*a = -47/20 // : -1/2
a = -47/20/(-1/2)
a = 47/10
a = 47/10
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