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