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y in (-oo:+oo)
(1/4)*y+2 = 7/2 // - 7/2
(1/4)*y-(7/2)+2 = 0
(1/4)*y-7/2+2 = 0
1/4*y-3/2 = 0 // + 3/2
1/4*y = 3/2 // : 1/4
y = 3/2/1/4
y = 6
y = 6
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