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x in (-oo:+oo)
x+x+x/3-7 = 42 // - 42
x+x+x/3-42-7 = 0
7/3*x-49 = 0 // + 49
7/3*x = 49 // : 7/3
x = 49/7/3
x = 21
x = 21
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