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x in (-oo:+oo)
(1/3)*x+(2/7)*x = x-16 // - x-16
(1/3)*x+(2/7)*x-x+16 = 0
16-8/21*x = 0 // - 16
-8/21*x = -16 // : -8/21
x = -16/(-8/21)
x = 42
x = 42
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