$\"\"$ $\"\"$

The given equation $\"\"$ .

According to addition property of equality: if a = b, then a + c = b + c.

$\"\"$ (Add 3.5 to each side)

$\"\"$ (Additive inverse property: $\"\"$ )

$\"\"$ (Add: $\"\"$ ) $\"\"$

Check:

To check solution Substitute $\"\"$ value in original equation.

$\"\"$

10 = 10 (Subtract: $\"\"$ ) $\"\"$

The value of $\"\"$ .