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x in (-oo:+oo)
x/2 = 9.4 // - 9.4
x/2-9.4 = 0
1/2*x-9.4 = 0 // + 9.4
1/2*x = 9.4 // : 1/2
x = 9.4/1/2
x = 18.8
x = 18.8
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