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y in (-oo:+oo)
(1/4)*y+2/4 = 7 // - 7
(1/4)*y+2/4-7 = 0
1/4*y-13/2 = 0 // + 13/2
1/4*y = 13/2 // : 1/4
y = 13/2/1/4
y = 26
y = 26
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