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y in (-oo:+oo)
(1/4)*y-(2/8) = 9 // - 9
(1/4)*y-(2/8)-9 = 0
(1/4)*y-1/4-9 = 0
1/4*y-37/4 = 0 // + 37/4
1/4*y = 37/4 // : 1/4
y = 37/4/1/4
y = 37
y = 37
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