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x in (-oo:+oo)
(13/10)*x = -39/38 // + -39/38
(13/10)*x-(-39/38) = 0
(13/10)*x+39/38 = 0
13/10*x+39/38 = 0 // - 39/38
13/10*x = -39/38 // : 13/10
x = -39/38/13/10
x = -15/19
x = -15/19
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