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y in (-oo:+oo)
(7/9)*y+2 = (5/9)*y+6 // - (5/9)*y+6
(7/9)*y-((5/9)*y)-6+2 = 0
(7/9)*y+(-5/9)*y-6+2 = 0
2/9*y-4 = 0 // + 4
2/9*y = 4 // : 2/9
y = 4/2/9
y = 18
y = 18
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