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a in (-oo:+oo)
(1/3)*a+1/2 = 9/14 // - 9/14
(1/3)*a+1/2-(9/14) = 0
(1/3)*a+1/2-9/14 = 0
1/3*a-1/7 = 0 // + 1/7
1/3*a = 1/7 // : 1/3
a = 1/7/1/3
a = 3/7
a = 3/7
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