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a in (-oo:+oo)
(3/7)*a-(6*a)-10 = -926/77 // + -926/77
(3/7)*a-(6*a)-(-926/77)-10 = 0
(3/7)*a-6*a+926/77-10 = 0
156/77-39/7*a = 0 // - 156/77
-39/7*a = -156/77 // : -39/7
a = -156/77/(-39/7)
a = 4/11
a = 4/11
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