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x in (-oo:+oo)
x/1.5 = 21 // - 21
x/1.5-21 = 0
0.66666667*x-21 = 0 // + 21
0.66666667*x = 21 // : 0.66666667
x = 21/0.66666667
x = 31.49999984
x = 31.49999984
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