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n in (-oo:+oo)
(1/4)*n+4/7 = -5/28 // + -5/28
(1/4)*n+4/7-(-5/28) = 0
(1/4)*n+4/7+5/28 = 0
1/4*n+3/4 = 0 // - 3/4
1/4*n = -3/4 // : 1/4
n = -3/4/1/4
n = -3
n = -3
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