8/21+x=5/7 - solution

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Solution for 8/21+x=5/7 equation:

x in (-oo:+oo)

x+8/21 = 5/7 // - 5/7

x+8/21-(5/7) = 0

x+8/21-5/7 = 0

x-1/3 = 0 // + 1/3

x = 1/3

x = 1/3

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