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y in (-oo:+oo)
1/7-((3/7)*y)-(4/7) = 0
(-3/7)*y+1/7-4/7 = 0
-3/7*y-3/7 = 0 // + 3/7
-3/7*y = 3/7 // : -3/7
y = 3/7/(-3/7)
y = -1
y = -1
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