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y in (-oo:+oo)
(-7/10)*y = 2/5 // - 2/5
(-7/10)*y-(2/5) = 0
(-7/10)*y-2/5 = 0
-7/10*y-2/5 = 0 // + 2/5
-7/10*y = 2/5 // : -7/10
y = 2/5/(-7/10)
y = -4/7
y = -4/7
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