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y in (-oo:+oo)
(1/4)*(y+8)+5 = 0
1/4*(y+8)+5 = 0
1/4*(y+8)+5 = 0
1/4*y+7 = 0
1/4*y+7 = 0
1/4*y+7 = 0 // - 7
1/4*y = -7 // : 1/4
y = -7/1/4
y = -28
y = -28
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