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x in (-oo:+oo)
x/6-2.5 = 3 // - 3
x/6-3-2.5 = 0
1/6*x-5.5 = 0 // + 5.5
1/6*x = 5.5 // : 1/6
x = 5.5/1/6
x = 32.99999934
x = 32.99999934
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