Question

Someone plz help me with these problems

Answer 1

1) 15
2) 2
3) 10

The images show how to solve it, but if you want a more in depth explanation, please tell me~

Answer 2

1) X= 15
     6x + 10 - 3x = 55
     3x + 10 = 55
     3x = 45
     x = 15
2) X = 2
     4x + 12 - 2x = 16
      2x + 12 = 16
     2x = 4
     x = 2
3) X=10     
     9x + 12 - 3x = 72
     6x + 12 = 72
     6x = 60
      X = 10