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a in (-oo:+oo)
(3/4)*a+7/9 = 7*a+103/36 // - 7*a+103/36
(3/4)*a-(7*a)+7/9-(103/36) = 0
(3/4)*a-7*a+7/9-103/36 = 0
-25/4*a-25/12 = 0 // + 25/12
-25/4*a = 25/12 // : -25/4
a = 25/12/(-25/4)
a = -1/3
a = -1/3
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