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2014-05-29T22:06:40+03:00
A*b=18
c*a=10
__________
(a*b)+(c*a)=18+10
a*(b+c)=28
a*(b+c)/7=28/7=4


a*b=18
c*a=10
_____________
(a*b)-(c*a)=18-10
a*(b-c)=8
a*(b-c)/8=8/8=1