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x in (-oo:+oo)
1/500 = x/875 // - x/875
1/500-(x/875) = 0
1/500-1/875*x = 0 // - 1/500
-1/875*x = -1/500 // : -1/875
x = -1/500/(-1/875)
x = 7/4
x = 7/4
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