R/4=20

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Solution for R/4=20 equation: 


R in (-oo:+oo)

R/4 = 20 // - 20

R/4-20 = 0

1/4*R-20 = 0 // + 20

1/4*R = 20 // : 1/4

R = 20/1/4

R = 80

R = 80

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