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(2*x-(23*x)-312)/12 = 0
(2*x-23*x-312)/12 = 0
(-21*x-312)/12 = 0
-21*x-312 = 0 // + 312
-21*x = 312 // : -21
x = 312/(-21)
x = -104/7
x = -104/7
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