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(a+2)/(b+2)=7/9.. (2)
..
a=3b/4.. (1)
9(a+2)=7(b+2).. (2)
9a+18=7b+14
9(3b/4)+18=7b+14.. x4(1)(2)
27b+72=28b+56
b=72-56=16
a=3(16)/4=12
..
axb=12x16=196