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y in (-oo:+oo)
y/9+7 = 4*(y-7) // - 4*(y-7)
y/9-(4*(y-7))+7 = 0
y/9-4*(y-7)+7 = 0
(-4*9*(y-7))/9+y/9+(7*9)/9 = 0
y-4*9*(y-7)+7*9 = 0
63-35*y+252 = 0
315-35*y = 0
(315-35*y)/9 = 0
(315-35*y)/9 = 0 // * 9
315-35*y = 0
315-35*y = 0 // - 315
-35*y = -315 // : -35
y = -315/(-35)
y = 9
y = 9
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