A plus [ b plus 12] = [b plus 12] plus a

Commutative law of addition

Step-by-step explanation:

a +[b+12] = [b+12] +a

The commutative law of addition states that when two variables are added the answer remains the same irrespective of the position of the variables but the variable must be equal .

This can be explained by numbers .

Suppose we have two numbers 4 and 7 then the law can written as

4+7= 7+4

11= 11

We see we get the same answer whether 4 is written before or after 7.

Similarly in the given equation we have two variables ,

one is a the other is [b+12] . So it does not matter whether a is written before or after [b+12] in addition.

Hence it satisfies the commutative law of addition

a +[b+12] = [b+12] +a

a+b+12= b+12 +a

a+b+12= a+b+12

After solving we will get the same answer on both sides.

1 x=22.52

2: 65/39=604+39x

65x-39x=604

26x=604

x=604/26

×=23.23