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y in (-oo:+oo)
(-2/5)*y = 8/10 // - 8/10
(-2/5)*y-(8/10) = 0
(-2/5)*y-4/5 = 0
-2/5*y-4/5 = 0 // + 4/5
-2/5*y = 4/5 // : -2/5
y = 4/5/(-2/5)
y = -2
y = -2
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