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x in (-oo:+oo)
x/500 = 18/75 // - 18/75
x/500-(18/75) = 0
x/500-6/25 = 0
1/500*x-6/25 = 0 // + 6/25
1/500*x = 6/25 // : 1/500
x = 6/25/1/500
x = 120
x = 120
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