$\"\"$

The equation is $\"\"$ \ \

$\"\"$ (Subtract ‘z’ from each side)

3y = am $\"\"$ 4y $\"\"$ z (Additive inverse property: z – z = 0)

$\"\"$ (Add 4y to each side)

$\"\"$ (Additive inverse property: 4y $\"\"$ 4y = 0)

$\"\"$ (Add: 3y + 4y = 7y)

$\"\"$ (Divide each side by 7)

$\"\"$ (Cancel common terms)

$\"\"$

Verify:

To check the solution, substitute $\"\"$ in original equation.

$\"\"$

$\"\"$ (Distributive property: $\"\"$ )

$\"\"$ (Simplify)

Compare the values, the equation is true.

$\"\"$

The value of $\"\"$ .