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