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x in (-oo:+oo)
4*x = 256/85 // - 256/85
4*x-(256/85) = 0
4*x-256/85 = 0
4*x-256/85 = 0 // + 256/85
4*x = 256/85 // : 4
x = 256/85/4
x = 64/85
x = 64/85
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