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