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a in (-oo:+oo)
2*a+5/6 = (-2/3)*a-(41/2) // - (-2/3)*a-(41/2)
2*a-((-2/3)*a)+5/6+41/2 = 0
2*a+(2/3)*a+5/6+41/2 = 0
8/3*a+64/3 = 0 // - 64/3
8/3*a = -64/3 // : 8/3
a = -64/3/8/3
a = -8
a = -8
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