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(3*x-14)/12 = 21 // - 21
(3*x-14)/12-21 = 0
(3*x-14)/12+(-21*12)/12 = 0
3*x-21*12-14 = 0
3*x-266 = 0
(3*x-266)/12 = 0
(3*x-266)/12 = 0 // * 12
3*x-266 = 0
3*x-266 = 0 // + 266
3*x = 266 // : 3
x = 266/3
x = 266/3
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