Question

(3,15 + ( 4,85у – 7,7)) – 7,8 = 7,05

Answer 1

(3.15 + 4.85y - 7.7) - 7.8 = 7.05
-4.55 + 4.85y - 7.8 = 7.05
-12,35 + 4.85y = 7.05
4.85y = 7.05 + 12.35
4.85y = 19,4
y = 4