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a in (-oo:+oo)
-614/231 = (5/6)*a+4*a+6/7 // - (5/6)*a+4*a+6/7
-((5/6)*a)-(4*a)-614/231-(6/7) = 0
(-5/6)*a-4*a-614/231-6/7 = 0
-29/6*a-116/33 = 0 // + 116/33
-29/6*a = 116/33 // : -29/6
a = 116/33/(-29/6)
a = -8/11
a = -8/11
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