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x in (-oo:+oo)
(k-x)/5 = 12 // - 12
(k-x)/5-12 = 0
(k-x)/5+(-12*5)/5 = 0
k-x-12*5 = 0
k-x-60 = 0
(k-x-60)/5 = 0
(k-x-60)/5 = 0 // * 5
k-x-60 = 0
k-x-60 = 0 // - k-60
-x = -(k-60) // * -1
x = k-60
x = k-60
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