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x in (-oo:+oo)
1.3 = x/0.7 // - x/0.7
1.3-(x/0.7) = 0
1.3-1.42857143*x = 0
1.3-1.42857143*x = 0 // - 1.3
-1.42857143*x = -1.3 // : -1.42857143
x = -1.3/(-1.42857143)
x = 0.91
x = 0.91
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