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x in (-oo:+oo)
x/6 = 2.5 // - 2.5
x/6-2.5 = 0
1/6*x-2.5 = 0 // + 2.5
1/6*x = 2.5 // : 1/6
x = 2.5/1/6
x = 14.9999997
x = 14.9999997
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