r/3+2r=7 - solution

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Solution for r/3+2r=7 equation:

r in (-oo:+oo)

r/3+2*r = 7 // - 7

r/3+2*r-7 = 0

7/3*r-7 = 0 // + 7

7/3*r = 7 // : 7/3

r = 7/7/3

r = 3

r = 3

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