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x in (-oo:+oo)
(3/4)*x = 10/13 // - 10/13
(3/4)*x-(10/13) = 0
(3/4)*x-10/13 = 0
3/4*x-10/13 = 0 // + 10/13
3/4*x = 10/13 // : 3/4
x = 10/13/3/4
x = 40/39
x = 40/39
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