r/2+6=-3 - solution

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Solution for r/2+6=-3 equation:

r in (-oo:+oo)

r/2+6 = -3 // + 3

r/2+3+6 = 0

1/2*r+9 = 0 // - 9

1/2*r = -9 // : 1/2

r = -9/1/2

r = -18

r = -18

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