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y in (-oo:+oo)
(-7/2)*y = 3 // - 3
(-7/2)*y-3 = 0
-7/2*y-3 = 0 // + 3
-7/2*y = 3 // : -7/2
y = 3/(-7/2)
y = -6/7
y = -6/7
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