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2*x+1/2 = 121/2 // - 121/2
2*x+1/2-(121/2) = 0
2*x+1/2-121/2 = 0
2*x-60 = 0 // + 60
2*x = 60 // : 2
x = 60/2
x = 30
x = 30
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