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64=½ *(7+b)*8
64=4*(7+b) ( 4 bo ½*8=4)
64=28+4b
64-28=4b
36=4b |:4
b=9
64= 4 razy (7 +b)
64= 28 + 4b
64-28= 4 b |;4
36:4= 8 ;)