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x in (-oo:+oo)
4*x-(2/15) = 2/3 // - 2/3
4*x-(2/15)-(2/3) = 0
4*x-2/15-2/3 = 0
4*x-4/5 = 0 // + 4/5
4*x = 4/5 // : 4
x = 4/5/4
x = 1/5
x = 1/5
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