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y in (-oo:+oo)
(1/3)*y+1/4 = 5/13 // - 5/13
(1/3)*y+1/4-(5/13) = 0
(1/3)*y+1/4-5/13 = 0
1/3*y-7/52 = 0 // + 7/52
1/3*y = 7/52 // : 1/3
y = 7/52/1/3
y = 21/52
y = 21/52
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