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y in (-oo:+oo)
-10 = y/3-4 // - y/3-4
4-(y/3)-10 = 0
-1/3*y-6 = 0 // + 6
-1/3*y = 6 // : -1/3
y = 6/(-1/3)
y = -18
y = -18
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