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y in (-oo:+oo)
4-((5/7)*y) = 7 // - 7
4-((5/7)*y)-7 = 0
(-5/7)*y-7+4 = 0
-5/7*y-3 = 0 // + 3
-5/7*y = 3 // : -5/7
y = 3/(-5/7)
y = -21/5
y = -21/5
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