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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
17/12*a-3/4 = 0 // + 3/4
17/12*a = 3/4 // : 17/12
a = 3/4/17/12
a = 9/17
a = 9/17
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