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a in (-oo:+oo)
2*a-1/3 = 6*a-(41/15) // - 6*a-(41/15)
2*a-(6*a)-1/3+41/15 = 0
2*a-6*a-1/3+41/15 = 0
12/5-4*a = 0 // - 12/5
-4*a = -12/5 // : -4
a = -12/5/(-4)
a = 3/5
a = 3/5
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