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2014-05-11T11:18:09+03:00
A+b=36
a=4+b

4+b+b=36
4+2xb=36
2xb=36-4
2xb=32
b=32:2
b=16

a=16+4
a=20
2014-05-11T11:23:58+03:00
A + b =36
a= b+4 
b+4+b = 36 
2 b + 4 = 36 
2 b = 36 -4 
2 b = 32
b= 32:2 
b= 16
a = b+4 
a = 16 + 4 
a= 20