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y in (-oo:+oo)
49 = (7/9)*(y+4) // - (7/9)*(y+4)
49-((7/9)*(y+4)) = 0
(-7/9)*(y+4)+49 = 0
49-7/9*(y+4) = 0
49-7/9*(y+4) = 0
413/9-7/9*y = 0
413/9-7/9*y = 0
413/9-7/9*y = 0 // - 413/9
-7/9*y = -413/9 // : -7/9
y = -413/9/(-7/9)
y = 59
y = 59
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