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y in (-oo:+oo)
49 = (7/9)*y // - (7/9)*y
49-((7/9)*y) = 0
(-7/9)*y+49 = 0
49-7/9*y = 0 // - 49
-7/9*y = -49 // : -7/9
y = -49/(-7/9)
y = 63
y = 63
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