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x in (-oo:+oo)
2*x+x+x/3 = 16.9 // - 16.9
2*x+x+x/3-16.9 = 0
10/3*x-16.9 = 0 // + 16.9
10/3*x = 16.9 // : 10/3
x = 16.9/10/3
x = 5.07000001
x = 5.07000001
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