a/2=b/3=c/4
=> a/2=2b/6=3c/12
=> a/2=2b/6=3c/12= a+2b‐3x / 2+6‐12 =‐20/‐4=5
=> a = 5.2=10
b= 5.6:2=15
c= 5.12:3=20
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