In my opinion, it is easier to use decimals than fractions, so first we are going to rewrite this equation with decimals instead of fraction values.
z - 0.75 = 6.5
To simplify this equation, we are going to add 0.75 to both sides of the equation, to cancel out this value on the left side.
z= 7.25
Your final answer is=7.25 or 7 1/4
