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x in (-oo:+oo)
(1/3)*x = 42/3 // - 42/3
(1/3)*x-(42/3) = 0
(1/3)*x-14 = 0
1/3*x-14 = 0 // + 14
1/3*x = 14 // : 1/3
x = 14/1/3
x = 42
x = 42
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