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x in (-oo:+oo)
x/1.5 = 20 // - 20
x/1.5-20 = 0
0.66666667*x-20 = 0 // + 20
0.66666667*x = 20 // : 0.66666667
x = 20/0.66666667
x = 29.99999985
x = 29.99999985
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