Question

What is the value of x

Answer 1

Take your problem and do 3x=x+40 and subtract the x from 3x and it should equal 2x then take 2x=40 divide 2x from 40 and your answer is 20

Answer 2

the 2 angles are congruent so...

x+40=3x    set the 2 equations equal to each other

40=2x      subtract x from both sides

20=x     divide by 2

x=20 is the final answer

Have a blessed day!