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X in (-oo:+oo)
(7*X)/10 = 5/10 // - 5/10
(7*X)/10-(5/10) = 0
(7*X)/10-1/2 = 0
7/10*X-1/2 = 0 // + 1/2
7/10*X = 1/2 // : 7/10
X = 1/2/7/10
X = 5/7
X = 5/7
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