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x in (-oo:+oo)
(4/7)*x-2 = 8 // - 8
(4/7)*x-8-2 = 0
4/7*x-10 = 0 // + 10
4/7*x = 10 // : 4/7
x = 10/4/7
x = 35/2
x = 35/2
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