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n in (-oo:+oo)
(4/7)*n-7 = -227/35 // + -227/35
(4/7)*n-(-227/35)-7 = 0
(4/7)*n+227/35-7 = 0
4/7*n-18/35 = 0 // + 18/35
4/7*n = 18/35 // : 4/7
n = 18/35/4/7
n = 9/10
n = 9/10
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