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x in (-oo:+oo)
x/0.5 = 8.12 // - 8.12
x/0.5-8.12 = 0
2*x-8.12 = 0 // + 8.12
2*x = 8.12 // : 2
x = 8.12/2
x = 4.06
x = 4.06
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