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x in (-oo:+oo)
2*x = 17/20 // - 17/20
2*x-(17/20) = 0
2*x-17/20 = 0
2*x-17/20 = 0 // + 17/20
2*x = 17/20 // : 2
x = 17/20/2
x = 17/40
x = 17/40
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