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x in (-oo:+oo)
x = y+2/7 // - y+2/7
x-y-(2/7) = 0
x-y-2/7 = 0
x-y-2/7 = 0 // + -y-2/7
x = -(-y-2/7)
x = y+2/7
x = y+2/7
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