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x in (-oo:+oo)
4/7 = x/5 // - x/5
4/7-(x/5) = 0
4/7-1/5*x = 0 // - 4/7
-1/5*x = -4/7 // : -1/5
x = -4/7/(-1/5)
x = 20/7
x = 20/7
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