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