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a in (-oo:+oo)
-7 = a/6-4 // - a/6-4
4-(a/6)-7 = 0
-1/6*a-3 = 0 // + 3
-1/6*a = 3 // : -1/6
a = 3/(-1/6)
a = -18
a = -18
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