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