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x in (-oo:+oo)
(4-x)/8 = 4 // - 4
(4-x)/8-4 = 0
(4-x)/8+(-4*8)/8 = 0
4-x-4*8 = 0
-x-28 = 0
(-x-28)/8 = 0
(-x-28)/8 = 0 // * 8
-x-28 = 0
-x-28 = 0 // + 28
-x = 28 // * -1
x = -28
x = -28
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