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y in (-oo:+oo)
(7/12)*y+3/4 = 2*y+y/4 // - 2*y+y/4
(7/12)*y-(2*y)-(y/4)+3/4 = 0
(7/12)*y-2*y-(y/4)+3/4 = 0
3/4-5/3*y = 0 // - 3/4
-5/3*y = -3/4 // : -5/3
y = -3/4/(-5/3)
y = 9/20
y = 9/20
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