Question

Plz help me to solve this​

Answer 1

4x+4x-9= 39

8x-9= 39

move -9 to the other side

sign changes from -9 to +9

8x-9+9= 39+9

8x= 39+9

8x= 48

divide by 8 for both sides to get x by itself

8x/8=48/8

Answer: x= 6

Answer 2

4x+4x-9=39
8x-9=39
8x=39+9
8x=48
X=48/8
X=6