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x in (-oo:+oo)
9.1 = x/(-0.7) // - x/(-0.7)
9.1-(x/(-0.7)) = 0
1.42857143*x+9.1 = 0
1.42857143*x+9.1 = 0 // - 9.1
1.42857143*x = -9.1 // : 1.42857143
x = -9.1/1.42857143
x = -6.36999999
x = -6.36999999
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