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a in (-oo:+oo)
-68/55 = 4*a-(6*a)+2/5 // - 4*a-(6*a)+2/5
6*a-(4*a)-68/55-(2/5) = 0
6*a-4*a-68/55-2/5 = 0
2*a-18/11 = 0 // + 18/11
2*a = 18/11 // : 2
a = 18/11/2
a = 9/11
a = 9/11
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