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x in (-oo:+oo)
x/6-1.5 = 2 // - 2
x/6-2-1.5 = 0
1/6*x-3.5 = 0 // + 3.5
1/6*x = 3.5 // : 1/6
x = 3.5/1/6
x = 20.99999958
x = 20.99999958
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