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x in (-oo:+oo)
2*(1-3*x) = 2/7 // - 2/7
2*(1-3*x)-(2/7) = 0
2*(1-3*x)-2/7 = 0
(2*7*(1-3*x))/7-2/7 = 0
2*7*(1-3*x)-2 = 0
12-42*x = 0
(12-42*x)/7 = 0
(12-42*x)/7 = 0 // * 7
12-42*x = 0
12-42*x = 0 // - 12
-42*x = -12 // : -42
x = -12/(-42)
x = 2/7
x = 2/7
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