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y in (-oo:+oo)
3/7-((4*y)/7) = 19/7 // - 19/7
3/7-((4*y)/7)-(19/7) = 0
(-4/7)*y+3/7-19/7 = 0
-4/7*y-16/7 = 0 // + 16/7
-4/7*y = 16/7 // : -4/7
y = 16/7/(-4/7)
y = -4
y = -4
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