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y in (-oo:+oo)
(2-5)*y = -(3/10) // + 3/10
(2-5)*y+3/10 = 0
3/10-3*y = 0 // - 3/10
-3*y = -3/10 // : -3
y = -3/10/(-3)
y = 1/10
y = 1/10
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