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X in (-oo:+oo)
(1/7)*X-3 = 4/5 // - 4/5
(1/7)*X-(4/5)-3 = 0
(1/7)*X-4/5-3 = 0
1/7*X-19/5 = 0 // + 19/5
1/7*X = 19/5 // : 1/7
X = 19/5/1/7
X = 133/5
X = 133/5
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