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a in (-oo:+oo)
149/35 = 9/10-6*a-((5/7)*a) // - 9/10-6*a-((5/7)*a)
(5/7)*a-(-6*a)+149/35-(9/10) = 0
6*a+(5/7)*a+149/35-9/10 = 0
47/7*a+47/14 = 0 // - 47/14
47/7*a = -47/14 // : 47/7
a = -47/14/47/7
a = -1/2
a = -1/2
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