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x in (-oo:+oo)
-310 = (12*x)/130 // - (12*x)/130
-((12*x)/130)-310 = 0
(-6/65)*x-310 = 0
-6/65*x-310 = 0 // + 310
-6/65*x = 310 // : -6/65
x = 310/(-6/65)
x = -10075/3
x = -10075/3
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