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2.5 = x/2-(2*x) // - x/2-(2*x)
2*x-(x/2)+2.5 = 0
3/2*x+2.5 = 0 // - 2.5
3/2*x = -2.5 // : 3/2
x = -2.5/3/2
x = -1.66666667
x = -1.66666667
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