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x in (-oo:+oo)
x-3 = 2*x+6/5 // - 2*x+6/5
x-(2*x)-(6/5)-3 = 0
x-2*x-6/5-3 = 0
-x-21/5 = 0 // + 21/5
-x = 21/5 // * -1
x = -21/5
x = -21/5
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