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x in (-oo:+oo)
x+(1/3)*x = 4.8 // - 4.8
x+(1/3)*x-4.8 = 0
4/3*x-4.8 = 0 // + 4.8
4/3*x = 4.8 // : 4/3
x = 4.8/4/3
x = 3.60000001
x = 3.60000001
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