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y in (-oo:+oo)
y/9 = -4/3 // + -4/3
y/9-(-4/3) = 0
y/9+4/3 = 0
1/9*y+4/3 = 0 // - 4/3
1/9*y = -4/3 // : 1/9
y = -4/3/1/9
y = -12
y = -12
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