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