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x in (-oo:+oo)
x/3.4-(1/5) = 0
x/3.4-1/5 = 0
0.29411765*x-1/5 = 0 // + 1/5
0.29411765*x = 1/5 // : 0.29411765
x = 1/5/0.29411765
x = 0.67999999
x = 0.67999999
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