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x in (-oo:+oo)
3/10 = x/7 // - x/7
3/10-(x/7) = 0
3/10-1/7*x = 0 // - 3/10
-1/7*x = -3/10 // : -1/7
x = -3/10/(-1/7)
x = 21/10
x = 21/10
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