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a=b+6
2(b+6) + 2b=52
a=b+6
2b+12+2b = 52
a=b+6
4b=40
a=b+6
b=10
a=16
Ob=52cm
Ob=2a+2b
a=?
b=a+6cm
Ob=2a+2(a+6cm)
Ob=2a+2a+12cm
2a+2a+12cm=52cm
4a=40cm/:4
a=10cm
b=10cm+6cm
b=16cm
1 bok: 6cm+x
2 bok: x
52:4=13
13-6=7
7×2=14
52-14=38
38÷2=19
1bok:19cm
2bok: 7cm