If I give my brother $5$ dollars, then we will have the same amount of money. If instead he gives me $14$ dollars, then I'll have twice as much money as he will have. How much money does my brother currently have (in dollars)?
x = money I have y = money my brother has
x = y + 5 x + 14 = 2y y + 5 + 14 = 2y y = 19
My brother has 19 dollars.