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y in (-oo:+oo)
4*y = y/4-3 // - y/4-3
4*y-(y/4)+3 = 0
15/4*y+3 = 0 // - 3
15/4*y = -3 // : 15/4
y = -3/15/4
y = -4/5
y = -4/5
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