Let x be the number of hours worked by me in a week.
Let y be the number of hours worked by the coffee shop owner in a week.
Given, the coffee shop owner work 12 more than twice as many hour as you. Hence, we can write
[tex]y=12+2x[/tex]Given, the coffee shop owner works 50 hours for each week.
Put y=50 in the above equation.
[tex]50=12+2x[/tex]