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(5*x)/8-(1/2) = 4 // - 4
(5*x)/8-(1/2)-4 = 0
(5*x)/8-1/2-4 = 0
5/8*x-9/2 = 0 // + 9/2
5/8*x = 9/2 // : 5/8
x = 9/2/5/8
x = 36/5
x = 36/5
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