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y in (-oo:+oo)
3*(y/4+6) = -18 // + 18
3*(y/4+6)+18 = 0
3*(1/4*y+6)+18 = 0
3*(1/4*y+6)+18 = 0
3/4*y+36 = 0
3/4*y+36 = 0
3/4*y+36 = 0 // - 36
3/4*y = -36 // : 3/4
y = -36/3/4
y = -48
y = -48
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