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a in (-oo:+oo)
(2/3)*a-(3/4) = (3/4)*a // - (3/4)*a
(2/3)*a-((3/4)*a)-(3/4) = 0
(2/3)*a+(-3/4)*a-3/4 = 0
-1/12*a-3/4 = 0 // + 3/4
-1/12*a = 3/4 // : -1/12
a = 3/4/(-1/12)
a = -9
a = -9
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