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x in (-oo:+oo)
(2/7)*x = 3*x+2 // - 3*x+2
(2/7)*x-(3*x)-2 = 0
(2/7)*x-3*x-2 = 0
-19/7*x-2 = 0 // + 2
-19/7*x = 2 // : -19/7
x = 2/(-19/7)
x = -14/19
x = -14/19
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