$\"\"$

The arithmetic sequence is $\"\"$

In the arithmetic sequence $\"\"$ and common difference $\"\"$

(Apply nth term of an arithmetic sequence formula: $\"\"$ )

$\"\"$ (Substitute $\"\"$ and $\"\"$ ) $\"\"$

$\"\"$ (Apply distributive property: $\"\"$ )

$\"\"$ (Product of two same signs is positive)

$\"\"$ (Apply commutative property of addition: a + b = b + a)

$\"\"$ (Add: 18 + 7 = 25) $\"\"$

The nth term of the arithmetic sequence equation is $\"\"$ .