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a in (-oo:+oo)
(-2/7)*a+(3/5)*a-(2/7) = 12/35 // - 12/35
(-2/7)*a+(3/5)*a-(2/7)-(12/35) = 0
(-2/7)*a+(3/5)*a-2/7-12/35 = 0
11/35*a-22/35 = 0 // + 22/35
11/35*a = 22/35 // : 11/35
a = 22/35/11/35
a = 2
a = 2
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