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(1/2)*(x-4) = 3 // - 3
(1/2)*(x-4)-3 = 0
1/2*(x-4)-3 = 0
1/2*(x-4)-3 = 0
1/2*x-5 = 0
1/2*x-5 = 0
1/2*x-5 = 0 // + 5
1/2*x = 5 // : 1/2
x = 5/1/2
x = 10
x = 10
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