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y in (-oo:+oo)
2*y-(7*y)+4/7+9/4 = -9 // + 9
2*y-(7*y)+4/7+9/4+9 = 0
2*y-7*y+4/7+9/4+9 = 0
331/28-5*y = 0 // - 331/28
-5*y = -331/28 // : -5
y = -331/28/(-5)
y = 331/140
y = 331/140
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