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x in (-oo:+oo)
(39/30)*x = -(15/30) // + 15/30
(39/30)*x+15/30 = 0
13/10*x+1/2 = 0 // - 1/2
13/10*x = -1/2 // : 13/10
x = -1/2/13/10
x = -5/13
x = -5/13
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