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n in (-oo:+oo)
(4/7)*n = 5.6 // - 5.6
(4/7)*n-5.6 = 0
4/7*n-5.6 = 0 // + 5.6
4/7*n = 5.6 // : 4/7
n = 5.6/4/7
n = 9.80000002
n = 9.80000002
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