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3a-b+13a-7b+3a+2b+2a=21a-6b
21*2-6*0,5=42-3=39
b)
3b-a+3b-a+2a+3b-a+3b-a+2a+3b-a+3b-a+2a+3b-a+3b-a+2a=24b
24*2=48
c)
a-b+3b+b+2a-b+2a-b+b+3b=5a+2b
5*2+2*0,5=10+1=11