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x in (-oo:+oo)
(5/4)*x = 142/7 // - 142/7
(5/4)*x-(142/7) = 0
(5/4)*x-142/7 = 0
5/4*x-142/7 = 0 // + 142/7
5/4*x = 142/7 // : 5/4
x = 142/7/5/4
x = 568/35
x = 568/35
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