Question

2/3/ 4/9х + 1/20=4/5
ПОМОГИТЕ ПОЖАЛУЙСТА БЕЗ ПРОПОРЦИЙ

Answer 1

2/3  4/9х + 1/20 = 4/5
4/9 х = (4/5 - 1/20):2/3 = (16/20 - 1/20):2/3 = 15/20 :2/3
4/9 х = 45/40
х = 45/40 :4/9 = 101/32 = 3 5/32