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S3 = a +(a+b) +(a+2b)= 15
S3= 3a +3b = 15
a + 6b = 20
a +b = 5
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5b = 15
b=3
a= 5-b = 2
t3ngah = (a + 44)/2 = 2 +44 /2 = 66/2 = 23