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x in (-oo:+oo)
(3/4)*x = 2/7 // - 2/7
(3/4)*x-(2/7) = 0
(3/4)*x-2/7 = 0
3/4*x-2/7 = 0 // + 2/7
3/4*x = 2/7 // : 3/4
x = 2/7/3/4
x = 8/21
x = 8/21
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