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y in (-oo:+oo)
y-4 = (3/4)*y // - (3/4)*y
y-((3/4)*y)-4 = 0
y+(-3/4)*y-4 = 0
1/4*y-4 = 0 // + 4
1/4*y = 4 // : 1/4
y = 4/1/4
y = 16
y = 16
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