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y in (-oo:+oo)
(1/2)*y-((2/3)*y) = -(3/4) // + 3/4
(1/2)*y-((2/3)*y)+3/4 = 0
(1/2)*y+(-2/3)*y+3/4 = 0
3/4-1/6*y = 0 // - 3/4
-1/6*y = -3/4 // : -1/6
y = -3/4/(-1/6)
y = 9/2
y = 9/2
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