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1*x-(4*((1/4)*x-3)) = 12 // - 12
1*x-(4*((1/4)*x-3))-12 = 0
x-4*((1/4)*x-3)-12 = 0
x-4*(1/4*x-3)-12 = 0
x-4*(1/4*x-3)-12 = 0
12-12 = 0
0 = 0
0 = 0
x belongs to the empty set
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