r*3/4=12

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Solution for r*3/4=12 equation: 


r in (-oo:+oo)

(3*r)/4 = 12 // - 12

(3*r)/4-12 = 0

3/4*r-12 = 0 // + 12

3/4*r = 12 // : 3/4

r = 12/3/4

r = 16

r = 16

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