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x in (-oo:+oo)
(5/7)*x = 20/7 // - 20/7
(5/7)*x-(20/7) = 0
(5/7)*x-20/7 = 0
5/7*x-20/7 = 0 // + 20/7
5/7*x = 20/7 // : 5/7
x = 20/7/5/7
x = 4
x = 4
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