Question

Is this correct?
I have a test tomorrow tell the answer quickly

Answer 1

No, it is not correct. You should divide by 21 and 3.

Explanation:

3x=21

x=7

Answer 2

Q 1)

3(x + 5) = 36

3x + 15 = 36

3x = 36 - 15

3x = 21

x = 21/3

x = 7

Verification:

3(x + 5) = 36

3(7 + 5) = 36

3(12) = 36

36 = 36

Hence proved that x = 7