Answer:
x = 30
Step-by-step explanation:
3/5x + 1/3x = 28
15(3/5x + 1/3x) = 15 × 28
15 × 3/5x + 15 × 1/3x = 420
3 × 3x + 5x = 420
9x + 5x = 420
14x = 420
