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12*(1/3)*x+3*4 = 4*6 // - 4*6
12*(1/3)*x+3*4-(4*6) = 0
12*(1/3)*x+3*4-24 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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