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(1/4)*(8*x-12)-20 = 0
1/4*(8*x-12)-20 = 0
1/4*(8*x-12)-20 = 0
2*x-23 = 0
2*x-23 = 0
2*x-23 = 0 // + 23
2*x = 23 // : 2
x = 23/2
x = 23/2
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