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x in (-oo:+oo)
3*x+2/5 = 4*x+4/5 // - 4*x+4/5
3*x-(4*x)+2/5-(4/5) = 0
3*x-4*x+2/5-4/5 = 0
-x-2/5 = 0 // + 2/5
-x = 2/5 // * -1
x = -2/5
x = -2/5
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