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x in (-oo:+oo)
3/7-5*x = -207/7 // + -207/7
3/7-5*x-(-207/7) = 0
3/7-5*x+207/7 = 0
30-5*x = 0 // - 30
-5*x = -30 // : -5
x = -30/(-5)
x = 6
x = 6
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