3-x/7=x/3

Solve the equation 3 - x/7 = x/3.

• Multiply both sides by 21 (LCM of 7 and 3): 21*(3 - x/7) = 21*(x/3)
• This gives: 63 - 3x = 7x
• So 63 = 10x, hence x = 63/10 = 6.3

Check: 3 - (6.3)/7 = 3 - 0.9 = 2.1, and (6.3)/3 = 2.1, so it matches.