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y in (-oo:+oo)
(-1/5)*(y+1) = 4 // - 4
(-1/5)*(y+1)-4 = 0
-1/5*(y+1)-4 = 0
-1/5*(y+1)-4 = 0
-1/5*y-21/5 = 0
-1/5*y-21/5 = 0
-1/5*y-21/5 = 0 // + 21/5
-1/5*y = 21/5 // : -1/5
y = 21/5/(-1/5)
y = -21
y = -21
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