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y in (-oo:+oo)
5-((7/9)*y) = 2 // - 2
5-((7/9)*y)-2 = 0
(-7/9)*y-2+5 = 0
3-7/9*y = 0 // - 3
-7/9*y = -3 // : -7/9
y = -3/(-7/9)
y = 27/7
y = 27/7
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