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y in (-oo:+oo)
(1/5)*y-(2/3) = 6 // - 6
(1/5)*y-(2/3)-6 = 0
(1/5)*y-2/3-6 = 0
1/5*y-20/3 = 0 // + 20/3
1/5*y = 20/3 // : 1/5
y = 20/3/1/5
y = 100/3
y = 100/3
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