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x in (-oo:+oo)
1.6 = x/700 // - x/700
1.6-(x/700) = 0
1.6-1/700*x = 0 // - 1.6
-1/700*x = -1.6 // : -1/700
x = -1.6/(-1/700)
x = 1120.00112
x = 1120.00112
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