10x+9=7x

Solve 10x + 9 = 7x.

• Subtract 7x from both sides: 3x + 9 = 0
• Subtract 9 from both sides: 3x = -9
• Divide by 3: x = -3

Check: 10(-3) + 9 = -30 + 9 = -21, and 7(-3) = -21. Correct.

Answer: x = -3

If you want, I can give a couple more similar practice problems.