Question

Find the mistake: Explain what the person did incorrectly while solving the problem or how you would solve it.

7x + 8 - 5x = 30


7x + 8 - 5x = 30


2x + 8 = 30


+8 +8


2x = 38


-divide each side by 2


x = 19

Answer 1

the mistake is from the 5th line

from the 3rd line,

2x+8=30

therefore,

2x=30-8

2x=24

x=24/2

x=12