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a in (-oo:+oo)
2/7-4*a-((2/3)*a) = -292/7 // + -292/7
2/7-4*a-((2/3)*a)-(-292/7) = 0
(-2/3)*a-4*a+2/7+292/7 = 0
42-14/3*a = 0 // - 42
-14/3*a = -42 // : -14/3
a = -42/(-14/3)
a = 9
a = 9
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