r/2-2=-7 - solution

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

r in (-oo:+oo)

r/2-2 = -7 // + 7

r/2-2+7 = 0

1/2*r+5 = 0 // - 5

1/2*r = -5 // : 1/2

r = -5/1/2

r = -10

r = -10

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