4+1/3r=r-8 - solution

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Solution for 4+1/3r=r-8 equation:

r in (-oo:+oo)

(1/3)*r+4 = r-8 // - r-8

(1/3)*r-r+4+8 = 0

12-2/3*r = 0 // - 12

-2/3*r = -12 // : -2/3

r = -12/(-2/3)

r = 18

r = 18

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