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y in (-oo:+oo)
(2/3)*y+4/6 = 12/20 // - 12/20
(2/3)*y+4/6-(12/20) = 0
(2/3)*y+4/6-3/5 = 0
2/3*y+1/15 = 0 // - 1/15
2/3*y = -1/15 // : 2/3
y = -1/15/2/3
y = -1/10
y = -1/10
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