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a in (-oo:+oo)
3/7-((4/7)*a) = 11/35 // - 11/35
3/7-((4/7)*a)-(11/35) = 0
(-4/7)*a+3/7-11/35 = 0
4/35-4/7*a = 0 // - 4/35
-4/7*a = -4/35 // : -4/7
a = -4/35/(-4/7)
a = 1/5
a = 1/5
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