The commutative property of addition can be used to rarrange this to
... 0 + 18 + 34 + 26
Then the identity property of addition can be used to remove the 0 term
... 18 + 34 + 26
We can use the associative property of addition to form the sum of 34 and 26, convenient because 4 and 6 "make a 10". That sum is 60, so now the sum is
... 18 + 60
which is easily seen to be
... 78