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a in (-oo:+oo)
a/4-a+1/3-3+6 = a-(2/3) // - a-(2/3)
a/4-a-a+1/3+2/3-3+6 = 0
4-7/4*a = 0 // - 4
-7/4*a = -4 // : -7/4
a = -4/(-7/4)
a = 16/7
a = 16/7
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