21+7/2r=-21 - solution

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Solution for 21+7/2r=-21 equation:

r in (-oo:+oo)

(7/2)*r+21 = -21 // + 21

(7/2)*r+21+21 = 0

7/2*r+42 = 0 // - 42

7/2*r = -42 // : 7/2

r = -42/7/2

r = -12

r = -12

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