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x in (-oo:+oo)
(25-x)/16 = 6 // - 6
(25-x)/16-6 = 0
(25-x)/16+(-6*16)/16 = 0
25-x-6*16 = 0
-x-71 = 0
(-x-71)/16 = 0
(-x-71)/16 = 0 // * 16
-x-71 = 0
-x-71 = 0 // + 71
-x = 71 // * -1
x = -71
x = -71
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