2 1/4 + 5 (1-y)= 2 aljabar kls 7

21/4 = 9/4 = 2,25

2,25 + 5(1-y) = 2
2,25 + 5 - 5y = 2
7,25 - 5y = 2
-5y = 2 - 7,25
5y = 5,25
y = 5,25 / 5
y = 1,05

semoga membantu

2 1/4 + 5 (1 _ y ) = 2
2 1/4 + 5 _ 5y = 2
2 1/4 + 5 _ 2 = 5y
9/4 + 20/4 _ 8/4 = 5y
21/4 = 5y
y = 21/4 : 5
y = 21/4 x 1/5
y = 21/40