12/7r-1/21r=r-2/3

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Solution for 12/7r-1/21r=r-2/3 equation: 


r in (-oo:+oo)

(12/7)*r-((1/21)*r) = r-(2/3) // - r-(2/3)

(12/7)*r-((1/21)*r)-r+2/3 = 0

(12/7)*r+(-1/21)*r-r+2/3 = 0

2/3*r+2/3 = 0 // - 2/3

2/3*r = -2/3 // : 2/3

r = -2/3/2/3

r = -1

r = -1

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