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x in (-oo:+oo)
4/7 = x/10 // - x/10
4/7-(x/10) = 0
4/7-1/10*x = 0 // - 4/7
-1/10*x = -4/7 // : -1/10
x = -4/7/(-1/10)
x = 40/7
x = 40/7
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