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