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(1/4)*x-((1/2)*x)-12-6 = 0
(1/4)*x+(-1/2)*x-12-6 = 0
-1/4*x-18 = 0 // + 18
-1/4*x = 18 // : -1/4
x = 18/(-1/4)
x = -72
x = -72
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