Worked example
x + 5 = 12
- Subtract 5 from the left and the right.
- The equality becomes x = 7.
- Reverse the move by adding 5: 7 + 5 = 12.
Math guide
An equation stays true when both sides change equally.
Understand equality as a balance and learn which operations preserve the solution set.
An equation states that two expressions have the same value. Applying the same reversible operation to each side preserves that equality and lets us isolate the unknown without changing which values satisfy the equation.
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