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a in (-oo:+oo)
(2/5)*a-(1/12) = (-3/5)*a-(3/4) // - (-3/5)*a-(3/4)
(2/5)*a-((-3/5)*a)-(1/12)+3/4 = 0
(2/5)*a+(3/5)*a-1/12+3/4 = 0
a+2/3 = 0 // - 2/3
a = -2/3
a = -2/3
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