14. Solve $4(x+9)=6 x-4$ A. 3.2 B. 6.5 C. 16 D. 20

Step 1 ：Expand the left side: 4(x+9)=4x+36

Step 2 ：Subtract 4x from both sides: 36=2x-4

Step 3 ：Add 4 to both sides: 40=2x

Step 4 ：Divide both sides by 2: x=20

Step 5 ：Check the solution: 4(20+9)=6(20)-4

Step 6 ：Simplify: 4(29)=120-4

Step 7 ：Simplify further: 116=116

Step 8 ：Final answer: x=\boxed{20}