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x in (-oo:+oo)
3/7-(2*x) = 63 // - 63
3/7-(2*x)-63 = 0
3/7-2*x-63 = 0
-2*x-438/7 = 0 // + 438/7
-2*x = 438/7 // : -2
x = 438/7/(-2)
x = -219/7
x = -219/7
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