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a in (-oo:+oo)
(1/2)*a+(2/7)*a+10 = 431/42 // - 431/42
(1/2)*a+(2/7)*a-(431/42)+10 = 0
(1/2)*a+(2/7)*a-431/42+10 = 0
11/14*a-11/42 = 0 // + 11/42
11/14*a = 11/42 // : 11/14
a = 11/42/11/14
a = 1/3
a = 1/3
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