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x in (-oo:+oo)
x/6-2.5 = 5 // - 5
x/6-5-2.5 = 0
1/6*x-7.5 = 0 // + 7.5
1/6*x = 7.5 // : 1/6
x = 7.5/1/6
x = 44.9999991
x = 44.9999991
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