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y in (-oo:+oo)
16 = 20-((1/4)*y) // - 20-((1/4)*y)
(1/4)*y-20+16 = 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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