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x in (-oo:+oo)
x/2 = 11.8 // - 11.8
x/2-11.8 = 0
1/2*x-11.8 = 0 // + 11.8
1/2*x = 11.8 // : 1/2
x = 11.8/1/2
x = 23.6
x = 23.6
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