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x in (-oo:+oo)
5/7 = (28/7)*x // - (28/7)*x
5/7-((28/7)*x) = 0
5/7-4*x = 0
5/7-4*x = 0 // - 5/7
-4*x = -5/7 // : -4
x = -5/7/(-4)
x = 5/28
x = 5/28
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