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y in (-oo:+oo)
(-2/5)*y = 7/8 // - 7/8
(-2/5)*y-(7/8) = 0
(-2/5)*y-7/8 = 0
-2/5*y-7/8 = 0 // + 7/8
-2/5*y = 7/8 // : -2/5
y = 7/8/(-2/5)
y = -35/16
y = -35/16
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