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y in (-oo:+oo)
2*(y/2+6)+2*y = -9 // + 9
2*(y/2+6)+2*y+9 = 0
2*(1/2*y+6)+2*y+9 = 0
2*(1/2*y+6)+2*y+9 = 0
3*y+9+12 = 0
3*y+21 = 0
3*y+21 = 0
3*y+21 = 0 // - 21
3*y = -21 // : 3
y = -21/3
y = -7
y = -7
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