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y in (-oo:+oo)
1/2-((1/3)*y) = -4/5 // + -4/5
1/2-((1/3)*y)-(-4/5) = 0
(-1/3)*y+1/2+4/5 = 0
13/10-1/3*y = 0 // - 13/10
-1/3*y = -13/10 // : -1/3
y = -13/10/(-1/3)
y = 39/10
y = 39/10
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