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y in (-oo:+oo)
(1/2)*y = -2-2 // + -2-2
(1/2)*y+2+2 = 0
1/2*y+4 = 0 // - 4
1/2*y = -4 // : 1/2
y = -4/1/2
y = -8
y = -8
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