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a+b=7a-7b. 5a-5b+5=a+b+1
8b=6a. 4a+4=6b
4b=3a. 2a+2=3b
4b/3=a. 8b/3+2=3b a=8. 2=3b-8b/3
2=b/3
b=6.
#. a.b= 48