1) 5x - 16 = 40 + x
5x - x = 40 + 16
4x = 56
x = 56 : 4
x = 14
2) 4x - 10 = 15 - x
4x + x = 15 + 10
5x = 25
x = 25 : 5
x = 5
3) 3x - 6 = 5x + 2
3x - 5x = 2 + 6
-2x = 8
x = 8 : (-2)
x = -4
4) 15 - x = 4x - 5
-x - 4x = -5 - 15
-5x = -20
x = -20 : (-5)
x = 4
7) 7x - 4 = 20 + 3x
7x - 3x = 20 + 4
4x = 24
x = 24 : 4
x = 6
8) 5x - 7 = -21 - 2x
5x + 2x = -21 + 7
7x = -14
x = -14 : 7
x = -2
9) x + 15 = 20 - 4x
x + 4x = 20 - 15
5x = 5
x = 5 : 5
x = 1
10) 17 - x = 7 - 6x
-x + 6x = 7 - 17
5x = -10
x = -10 : 5
x = -2
5,x - 15 = 6 + 4x
4x - x = -15 - 6
3x = -21
x = -21 : 3 = -7
6)-12 + x = 5x - 20
5x -x = 20 - 12
4x = 8
x = 2