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y in (-oo:+oo)
9 = (-3/(-4))*y // - (-3/(-4))*y
9-((-3/(-4))*y) = 0
(-3/4)*y+9 = 0
9-3/4*y = 0 // - 9
-3/4*y = -9 // : -3/4
y = -9/(-3/4)
y = 12
y = 12
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