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6-((2*x)/4) = 12 // - 12
6-((2*x)/4)-12 = 0
(-1/2)*x-12+6 = 0
-1/2*x-6 = 0 // + 6
-1/2*x = 6 // : -1/2
x = 6/(-1/2)
x = -12
x = -12
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