4. \( 5 b-2+2 b=19 \)

To solve the equation \( 5b - 2 + 2b = 19 \), start by combining like terms. This gives you \( 7b - 2 = 19 \). Next, add 2 to both sides, resulting in \( 7b = 21 \). Finally, divide by 7 to find \( b = 3 \). There you have it, b equals 3! What’s fun about solving equations like this is that they can be found in real-life situations, such as budgeting your expenses or calculating distances. For example, if you know the cost of items in your shopping cart (represented by your unknown), you can easily calculate how much you need to adjust your budget to meet your target spending limit!