7.E.1 — Solve two-step equations.
Step 01 of 03
A two-step equation has TWO operations on the variable. Undo them in REVERSE order — addition/subtraction first, then multiplication/division.
Step 02 of 03
With negatives:
Always do the SAME operation to BOTH sides.
Step 03 of 03
Always check by plugging in:
Key insight
Reverse PEMDAS: undo additions first, then multiplications. Whatever you do to one side, do to the other. Check by plugging back in.