P=40=2(a+(a-4.4))
20=2a-4.4
2a=24.4
a=12.2
b=12.2-4.4=7.8
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P=40=2(a+(a-4.4))
20=2a-4.4
2a=24.4
a=12.2
b=12.2-4.4=7.8