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y in (-oo:+oo)
16 = 30-((1/4)*y) // - 30-((1/4)*y)
(1/4)*y-30+16 = 0
1/4*y-14 = 0 // + 14
1/4*y = 14 // : 1/4
y = 14/1/4
y = 56
y = 56
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