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x in (-oo:+oo)
2*x+(1/3)*x = 42 // - 42
2*x+(1/3)*x-42 = 0
7/3*x-42 = 0 // + 42
7/3*x = 42 // : 7/3
x = 42/7/3
x = 18
x = 18
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