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y in (-oo:+oo)
(2/9)*y+1/2 = (1/9)*y+9/7 // - (1/9)*y+9/7
(2/9)*y-((1/9)*y)+1/2-(9/7) = 0
(2/9)*y+(-1/9)*y+1/2-9/7 = 0
1/9*y-11/14 = 0 // + 11/14
1/9*y = 11/14 // : 1/9
y = 11/14/1/9
y = 99/14
y = 99/14
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