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