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x in (-oo:+oo)
(4/7)*x-7 = 6 // - 6
(4/7)*x-7-6 = 0
4/7*x-13 = 0 // + 13
4/7*x = 13 // : 4/7
x = 13/4/7
x = 91/4
x = 91/4
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