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(1/3)*(12-(4*x)) = 16 // - 16
(1/3)*(12-(4*x))-16 = 0
(1/3)*(12-4*x)-16 = 0
1/3*(12-4*x)-16 = 0
1/3*(12-4*x)-16 = 0
-4/3*x-12 = 0
-4/3*x-12 = 0
-4/3*x-12 = 0 // + 12
-4/3*x = 12 // : -4/3
x = 12/(-4/3)
x = -9
x = -9
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