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y in (-oo:+oo)
y/3+4 = (4*y)/9-3 // - (4*y)/9-3
y/3-((4*y)/9)+3+4 = 0
y/3+(-4/9)*y+3+4 = 0
7-1/9*y = 0 // - 7
-1/9*y = -7 // : -1/9
y = -7/(-1/9)
y = 63
y = 63
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