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x in (-oo:+oo)
(2*x)/5 = x+6 // - x+6
(2*x)/5-x-6 = 0
-3/5*x-6 = 0 // + 6
-3/5*x = 6 // : -3/5
x = 6/(-3/5)
x = -10
x = -10
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