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x in (-oo:+oo)
(6/7)*x-(5/7) = 4 // - 4
(6/7)*x-(5/7)-4 = 0
(6/7)*x-5/7-4 = 0
6/7*x-33/7 = 0 // + 33/7
6/7*x = 33/7 // : 6/7
x = 33/7/6/7
x = 11/2
x = 11/2
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