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x in (-oo:+oo)
(4/7)*x = 2/3 // - 2/3
(4/7)*x-(2/3) = 0
(4/7)*x-2/3 = 0
4/7*x-2/3 = 0 // + 2/3
4/7*x = 2/3 // : 4/7
x = 2/3/4/7
x = 7/6
x = 7/6
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