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(1/4)*(28*x-16)-x-4 = 0
1/4*(28*x-16)-x-4 = 0
1/4*(28*x-16)-x-4 = 0
6*x-4-4 = 0
6*x-8 = 0
6*x-8 = 0
6*x-8 = 0 // + 8
6*x = 8 // : 6
x = 8/6
x = 4/3
x = 4/3
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