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x in (-oo:+oo)
1/7-3*x = -1 // + 1
1/7-3*x+1 = 0
8/7-3*x = 0 // - 8/7
-3*x = -8/7 // : -3
x = -8/7/(-3)
x = 8/21
x = 8/21
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