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x in (-oo:+oo)
x/6 = 9.9 // - 9.9
x/6-9.9 = 0
1/6*x-9.9 = 0 // + 9.9
1/6*x = 9.9 // : 1/6
x = 9.9/1/6
x = 59.39999881
x = 59.39999881
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