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x in (-oo:+oo)
(13-x)/8 = 0.6 // - 0.6
(13-x)/8-0.6 = 0
(13-x)/8+(-0.6*8)/8 = 0
13-x-0.6*8 = 0
8.2-x = 0
(8.2-x)/8 = 0
(8.2-x)/8 = 0 // * 8
8.2-x = 0
8.2-x = 0 // - 8.2
-x = -8.2 // * -1
x = 8.2
x = 8.2
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