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x in (-oo:+oo)
x+2*x+(1/3)*x = 20 // - 20
x+2*x+(1/3)*x-20 = 0
10/3*x-20 = 0 // + 20
10/3*x = 20 // : 10/3
x = 20/10/3
x = 6
x = 6
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