Some equations aren't ready for the two-step dance right away — there's a knot to untangle first. Distribute or combine like terms, and it becomes an equation you already know how to solve.
Look at this equation:
This isn't a two-step equation yet — the x is stuck inside parentheses. Before we can undo any operation, we need to simplify one side first. Once it's simplified, it turns into an equation you already know how to solve.
There are two ways an equation might need simplifying before it's ready:
Distribute — when a number sits right outside parentheses, like 3(x + 4), spread it across both terms inside: 3x + 12.
Combine like terms — when the variable shows up more than once on the same side, like 2x + 3x, add the matching terms together: 5x.
Once the equation is simplified, it's a two-step equation — undo addition/subtraction first, then multiplication/division. Watch it happen with 3(x + 4) = 21:
Your turn to guide the solve. Every equation here needs a simplify step first — watch for whether it's asking you to distribute or combine like terms — then finish it off just like a two-step equation.
When you distribute, the outside number has to multiply every term inside the parentheses — not just the x. Watch what happens to 3(x + 4) = 21 if the 4 gets left behind:
Every term inside the parentheses needs the same treatment. Multiply the 3 into the x and into the 4 — skip one and you'll land on a messy, incorrect answer.
Solve each multi-step equation. Fill in the line after you simplify, the line after you undo addition/subtraction, then the final value. Press Check — you earn a point when all three blanks are right on the first try.