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x in (-oo:+oo)
x/85 = 52/20 // - 52/20
x/85-(52/20) = 0
x/85-13/5 = 0
1/85*x-13/5 = 0 // + 13/5
1/85*x = 13/5 // : 1/85
x = 13/5/1/85
x = 221
x = 221
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