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x in (-oo:+oo)
2.19 = x/2-x // - x/2-x
x-(x/2)+2.19 = 0
1/2*x+2.19 = 0 // - 2.19
1/2*x = -2.19 // : 1/2
x = -2.19/1/2
x = -4.38
x = -4.38
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