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y in (-oo:+oo)
(-1/2)*y = (2/7)*y+3/2-(8/9) // - (2/7)*y+3/2-(8/9)
(-1/2)*y-((2/7)*y)-(3/2)+8/9 = 0
(-1/2)*y+(-2/7)*y-3/2+8/9 = 0
-11/14*y-11/18 = 0 // + 11/18
-11/14*y = 11/18 // : -11/14
y = 11/18/(-11/14)
y = -7/9
y = -7/9
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