r/2+4r=18

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Solution for r/2+4r=18 equation: 


r in (-oo:+oo)

r/2+4*r = 18 // - 18

r/2+4*r-18 = 0

9/2*r-18 = 0 // + 18

9/2*r = 18 // : 9/2

r = 18/9/2

r = 4

r = 4

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