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x in (-oo:+oo)
(2*x)/5 = (6*x)/5+6 // - (6*x)/5+6
(2*x)/5-((6*x)/5)-6 = 0
(2*x)/5+(-6/5)*x-6 = 0
-4/5*x-6 = 0 // + 6
-4/5*x = 6 // : -4/5
x = 6/(-4/5)
x = -15/2
x = -15/2
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