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x in (-oo:+oo)
(1/7)*x+(2/3)*x = 1 // - 1
(1/7)*x+(2/3)*x-1 = 0
17/21*x-1 = 0 // + 1
17/21*x = 1 // : 17/21
x = 1/17/21
x = 21/17
x = 21/17
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