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a in (-oo:+oo)
(-1/3)*a-4+9 = 7 // - 7
(-1/3)*a-7-4+9 = 0
-1/3*a-2 = 0 // + 2
-1/3*a = 2 // : -1/3
a = 2/(-1/3)
a = -6
a = -6
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