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a in (-oo:+oo)
-103/280 = (-3/5)*a-((1/7)*a)+3/8 // - (-3/5)*a-((1/7)*a)+3/8
(1/7)*a-((-3/5)*a)-103/280-(3/8) = 0
(3/5)*a+(1/7)*a-103/280-3/8 = 0
26/35*a-26/35 = 0 // + 26/35
26/35*a = 26/35 // : 26/35
a = 26/35/26/35
a = 1
a = 1
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