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x in (-oo:+oo)
3-(7*x) = 1/7 // - 1/7
3-(7*x)-(1/7) = 0
3-7*x-1/7 = 0
20/7-7*x = 0 // - 20/7
-7*x = -20/7 // : -7
x = -20/7/(-7)
x = 20/49
x = 20/49
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