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x in (-oo:+oo)
(6/7)*x-(4/7) = 5 // - 5
(6/7)*x-(4/7)-5 = 0
(6/7)*x-4/7-5 = 0
6/7*x-39/7 = 0 // + 39/7
6/7*x = 39/7 // : 6/7
x = 39/7/6/7
x = 13/2
x = 13/2
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