f/2-21=-27 - solution

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Solution for f/2-21=-27 equation:

f in (-oo:+oo)

f/2-21 = -27 // + 27

f/2-21+27 = 0

1/2*f+6 = 0 // - 6

1/2*f = -6 // : 1/2

f = -6/1/2

f = -12

f = -12

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