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x in (-oo:+oo)
39/59 = (4*x)/19 // - (4*x)/19
39/59-((4*x)/19) = 0
(-4/19)*x+39/59 = 0
39/59-4/19*x = 0 // - 39/59
-4/19*x = -39/59 // : -4/19
x = -39/59/(-4/19)
x = 741/236
x = 741/236
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