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5*x+1/2 = 41/2 // - 41/2
5*x+1/2-(41/2) = 0
5*x+1/2-41/2 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x = 4
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