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(1-x)/3 = -4 // + 4
(1-x)/3+4 = 0
(1-x)/3+(3*4)/3 = 0
3*4-x+1 = 0
13-x = 0
(13-x)/3 = 0
(13-x)/3 = 0 // * 3
13-x = 0
13-x = 0 // - 13
-x = -13 // * -1
x = 13
x = 13
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