18=r/4-2

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Solution for 18=r/4-2 equation: 


r in (-oo:+oo)

18 = r/4-2 // - r/4-2

2-(r/4)+18 = 0

20-1/4*r = 0 // - 20

-1/4*r = -20 // : -1/4

r = -20/(-1/4)

r = 80

r = 80

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