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x in (-oo:+oo)
(1/7)*x+(1/6)*x = 39 // - 39
(1/7)*x+(1/6)*x-39 = 0
13/42*x-39 = 0 // + 39
13/42*x = 39 // : 13/42
x = 39/13/42
x = 126
x = 126
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