Solving Equations

Question 1:

x10=4x40
x =10

Question 2:

3x9=6x27
x =6

Question 3:

2x+3=10x29
x =4

Question 4:

9x+10=8x+12
x =2

Question 5:

7x+9=6x+21
x =12

Question 6:

7x+9=5x+31
x =11