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x in (-oo:+oo)
(13-x)/4 = 5 // - 5
(13-x)/4-5 = 0
(13-x)/4+(-5*4)/4 = 0
13-x-5*4 = 0
-x-7 = 0
(-x-7)/4 = 0
(-x-7)/4 = 0 // * 4
-x-7 = 0
-x-7 = 0 // + 7
-x = 7 // * -1
x = -7
x = -7
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