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y in (-oo:+oo)
11 = (4/9)*y+7 // - (4/9)*y+7
11-((4/9)*y)-7 = 0
(-4/9)*y-7+11 = 0
4-4/9*y = 0 // - 4
-4/9*y = -4 // : -4/9
y = -4/(-4/9)
y = 9
y = 9
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