5/6r-(-1/3r)=-21

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Solution for 5/6r-(-1/3r)=-21 equation: 


r in (-oo:+oo)

(5/6)*r-((-1/3)*r) = -21 // + 21

(5/6)*r-((-1/3)*r)+21 = 0

(5/6)*r+(1/3)*r+21 = 0

7/6*r+21 = 0 // - 21

7/6*r = -21 // : 7/6

r = -21/7/6

r = -18

r = -18

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