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y in (-oo:+oo)
(1/2)*y-(2/5) = -1/3 // + -1/3
(1/2)*y-(2/5)-(-1/3) = 0
(1/2)*y-2/5+1/3 = 0
1/2*y-1/15 = 0 // + 1/15
1/2*y = 1/15 // : 1/2
y = 1/15/1/2
y = 2/15
y = 2/15
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