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y in (-oo:+oo)
(-7/5)*y = 28/5 // - 28/5
(-7/5)*y-(28/5) = 0
(-7/5)*y-28/5 = 0
-7/5*y-28/5 = 0 // + 28/5
-7/5*y = 28/5 // : -7/5
y = 28/5/(-7/5)
y = -4
y = -4
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