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a in (-oo:+oo)
-59/12 = 6*a+(1/5)*a+1/4 // - 6*a+(1/5)*a+1/4
-(6*a)-((1/5)*a)-59/12-(1/4) = 0
(-1/5)*a-6*a-59/12-1/4 = 0
-31/5*a-31/6 = 0 // + 31/6
-31/5*a = 31/6 // : -31/5
a = 31/6/(-31/5)
a = -5/6
a = -5/6
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