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y in (-oo:+oo)
(2/9)*y-(7/8) = (7/9)*y-(3/4) // - (7/9)*y-(3/4)
(2/9)*y-((7/9)*y)-(7/8)+3/4 = 0
(2/9)*y+(-7/9)*y-7/8+3/4 = 0
-5/9*y-1/8 = 0 // + 1/8
-5/9*y = 1/8 // : -5/9
y = 1/8/(-5/9)
y = -9/40
y = -9/40
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