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x in (-oo:+oo)
1*x+(1/3)*x = 8 // - 8
1*x+(1/3)*x-8 = 0
x+(1/3)*x-8 = 0
4/3*x-8 = 0 // + 8
4/3*x = 8 // : 4/3
x = 8/4/3
x = 6
x = 6
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