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a in (-oo:+oo)
a/0.7 = 160 // - 160
a/0.7-160 = 0
1.42857143*a-160 = 0 // + 160
1.42857143*a = 160 // : 1.42857143
a = 160/1.42857143
a = 111.99999989
a = 111.99999989
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