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x in (-oo:+oo)
x/2.3 = 12 // - 12
x/2.3-12 = 0
0.43478261*x-12 = 0 // + 12
0.43478261*x = 12 // : 0.43478261
x = 12/0.43478261
x = 27.59999992
x = 27.59999992
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