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y in (-oo:+oo)
-((2/3)*y)-4/5 = -1/2 // + -1/2
-((2/3)*y)-4/5-(-1/2) = 0
(-2/3)*y-4/5+1/2 = 0
-2/3*y-3/10 = 0 // + 3/10
-2/3*y = 3/10 // : -2/3
y = 3/10/(-2/3)
y = -9/20
y = -9/20
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