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x in (-oo:+oo)
(6/7)*x-(10/7) = 4 // - 4
(6/7)*x-(10/7)-4 = 0
(6/7)*x-10/7-4 = 0
6/7*x-38/7 = 0 // + 38/7
6/7*x = 38/7 // : 6/7
x = 38/7/6/7
x = 19/3
x = 19/3
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