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x in (-oo:+oo)
(4/7)*x-4 = 2 // - 2
(4/7)*x-4-2 = 0
4/7*x-6 = 0 // + 6
4/7*x = 6 // : 4/7
x = 6/4/7
x = 21/2
x = 21/2
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