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(12*16-x)/11 = 15 // - 15
(12*16-x)/11-15 = 0
(192-x)/11-15 = 0
(192-x)/11+(-15*11)/11 = 0
192-x-15*11 = 0
27-x = 0
(27-x)/11 = 0
(27-x)/11 = 0 // * 11
27-x = 0
27-x = 0 // - 27
-x = -27 // * -1
x = 27
x = 27
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