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y in (-oo:+oo)
7*(5-((3*y)/7)) = 0
7*((-3/7)*y+5) = 0
7*(5-3/7*y) = 0
5-3/7*y = 0 // - 5
-3/7*y = -5 // : -3/7
y = -5/(-3/7)
y = 35/3
y = 35/3
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