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(15-x)/4 = -2 // + 2
(15-x)/4+2 = 0
(15-x)/4+(2*4)/4 = 0
2*4-x+15 = 0
23-x = 0
(23-x)/4 = 0
(23-x)/4 = 0 // * 4
23-x = 0
23-x = 0 // - 23
-x = -23 // * -1
x = 23
x = 23
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