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a in (-oo:+oo)
2*a+2/5 = (-1/2)*a-(103/55) // - (-1/2)*a-(103/55)
2*a-((-1/2)*a)+2/5+103/55 = 0
2*a+(1/2)*a+2/5+103/55 = 0
5/2*a+25/11 = 0 // - 25/11
5/2*a = -25/11 // : 5/2
a = -25/11/5/2
a = -10/11
a = -10/11
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