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(1/2)*x-4 = 3/8 // - 3/8
(1/2)*x-(3/8)-4 = 0
(1/2)*x-3/8-4 = 0
1/2*x-35/8 = 0 // + 35/8
1/2*x = 35/8 // : 1/2
x = 35/8/1/2
x = 35/4
x = 35/4
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