7/4=r-4/20 - solution

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Solution for 7/4=r-4/20 equation:

r in (-oo:+oo)

7/4 = r-(4/20) // - r-(4/20)

7/4-r+4/20 = 0

39/20-r = 0 // - 39/20

-r = -39/20 // * -1

r = 39/20

r = 39/20

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