2=r/4-1

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Solution for 2=r/4-1 equation: 


r in (-oo:+oo)

2 = r/4-1 // - r/4-1

1-(r/4)+2 = 0

3-1/4*r = 0 // - 3

-1/4*r = -3 // : -1/4

r = -3/(-1/4)

r = 12

r = 12

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