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x in (-oo:+oo)
(2*x)/7 = x-3 // - x-3
(2*x)/7-x+3 = 0
3-5/7*x = 0 // - 3
-5/7*x = -3 // : -5/7
x = -3/(-5/7)
x = 21/5
x = 21/5
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