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a in (-oo:+oo)
37/5 = 3*a+(2/5)*a+3/5 // - 3*a+(2/5)*a+3/5
37/5-(3*a)-((2/5)*a)-(3/5) = 0
(-2/5)*a-3*a+37/5-3/5 = 0
34/5-17/5*a = 0 // - 34/5
-17/5*a = -34/5 // : -17/5
a = -34/5/(-17/5)
a = 2
a = 2
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