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x in (-oo:+oo)
-5/3 = x/12 // - x/12
-(x/12)-5/3 = 0
-1/12*x-5/3 = 0 // + 5/3
-1/12*x = 5/3 // : -1/12
x = 5/3/(-1/12)
x = -20
x = -20
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