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y in (-oo:+oo)
-((5/7)*y)-5/7 = 5 // - 5
-((5/7)*y)-5/7-5 = 0
(-5/7)*y-5/7-5 = 0
-5/7*y-40/7 = 0 // + 40/7
-5/7*y = 40/7 // : -5/7
y = 40/7/(-5/7)
y = -8
y = -8
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