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x in (-oo:+oo)
x/7+(5*x)/7 = 12 // - 12
x/7+(5*x)/7-12 = 0
6/7*x-12 = 0 // + 12
6/7*x = 12 // : 6/7
x = 12/6/7
x = 14
x = 14
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