One-Step Equations

≈ 25 min

A one-step equation needs exactly one inverse operation to isolate the variable.

Example 1 (undo an addition).

x + 8 = 15 \;\Rightarrow\; x = 15 - 8 = 7

Example 2 (undo a multiplication).

5x = 45 \;\Rightarrow\; x = \frac{45}{5} = 9

Example 3 (undo a division).

\frac{x}{4} = 6 \;\Rightarrow\; x = 6 \times 4 = 24

Always finish with a substitution check: $5(9) = 45$ ✓

Solve for $x$ : $x + 8 = 15$

Solve for $x$ : $5x = 45$

Solve and give your answer in the form x=…: $x - 3.5 = 6.5$