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y in (-oo:+oo)
7*y = 1/4 // - 1/4
7*y-(1/4) = 0
7*y-1/4 = 0
7*y-1/4 = 0 // + 1/4
7*y = 1/4 // : 7
y = 1/4/7
y = 1/28
y = 1/28
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