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x in (-oo:+oo)
18/156 = x/500 // - x/500
18/156-(x/500) = 0
3/26-1/500*x = 0 // - 3/26
-1/500*x = -3/26 // : -1/500
x = -3/26/(-1/500)
x = 750/13
x = 750/13
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