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