a-b=b
What can you gather from this?
2xb=a
a-a=a
What can you gather from this?
a=0
The only number who, minus itself, equals itself, is 0
0-0=0
a-b=a
What can you deduce from this?
b=0
a-a=b
What can you deduce from this?
b=0
a+a=b
What can you deduce from this?
b=ax2
a+b=b
a=0
a+b=a
b=0
axb=a
b=1
or
a=0
axa=b
b=a squared
a:b=b
a=b squared
a:a=b
b=1
a:a=a
a=1 or 0
a:b=a
b=1