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y in (-oo:+oo)
7 = (9*y)/7+4 // - (9*y)/7+4
7-((9*y)/7)-4 = 0
(-9/7)*y-4+7 = 0
3-9/7*y = 0 // - 3
-9/7*y = -3 // : -9/7
y = -3/(-9/7)
y = 7/3
y = 7/3
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