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x in (-oo:+oo)
7/10 = x/700 // - x/700
7/10-(x/700) = 0
7/10-1/700*x = 0 // - 7/10
-1/700*x = -7/10 // : -1/700
x = -7/10/(-1/700)
x = 490
x = 490
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