r/2+3r=21

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Solution for r/2+3r=21 equation: 


r in (-oo:+oo)

r/2+3*r = 21 // - 21

r/2+3*r-21 = 0

7/2*r-21 = 0 // + 21

7/2*r = 21 // : 7/2

r = 21/7/2

r = 6

r = 6

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