r-7/9=20/9 - solution

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Solution for r-7/9=20/9 equation:

r in (-oo:+oo)

r-(7/9) = 20/9 // - 20/9

r-(7/9)-(20/9) = 0

r-7/9-20/9 = 0

r-3 = 0 // + 3

r = 3

r = 3

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