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(1/2)*(3*x+12)-20 = 0
1/2*(3*x+12)-20 = 0
1/2*(3*x+12)-20 = 0
3/2*x-14 = 0
3/2*x-14 = 0
3/2*x-14 = 0 // + 14
3/2*x = 14 // : 3/2
x = 14/3/2
x = 28/3
x = 28/3
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