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a in (-oo:+oo)
-326/7 = (-2/5)*a+5*a-(4/7) // - (-2/5)*a+5*a-(4/7)
4/7-((-2/5)*a)-(5*a)-326/7 = 0
(2/5)*a-5*a-326/7+4/7 = 0
-23/5*a-46 = 0 // + 46
-23/5*a = 46 // : -23/5
a = 46/(-23/5)
a = -10
a = -10
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