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x in (-oo:+oo)
2*x = 340/8 // - 340/8
2*x-(340/8) = 0
2*x-85/2 = 0
2*x-85/2 = 0 // + 85/2
2*x = 85/2 // : 2
x = 85/2/2
x = 85/4
x = 85/4
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