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