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x in (-oo:+oo)
12*((1/3)*x-(1/2)) = 4*x+21 // - 4*x+21
12*((1/3)*x-(1/2))-(4*x)-21 = 0
12*((1/3)*x-1/2)-4*x-21 = 0
12*(1/3*x-1/2)-4*x-21 = 0
12*(1/3*x-1/2)-4*x-21 = 0
-21-6 = 0
-27 = 0
-27 = 0
x belongs to the empty set
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