Assertion (A) : 7x = -21 ⇒ ⇒ x = -3 Reason (R) : An equation remains unchanged on dividing both sides by the same (non-zero) number. 1. Both A and R are correct, and R is the correct explanation for A. 2. Both A and R are correct, and R is not the correct explanation for A. 3. A is true, but R is false. 4. A is false, but R is true.