\(25x\left(12-\dfrac{36}{y}\right)=200\\ < =>12-\dfrac{36}{y}=\dfrac{200}{25}=8\\ < =>\dfrac{36}{y}=12-8=4\\ < =>y=\dfrac{36}{4}=9\)
25 × ( 12-36:y)=200
( 12-36:y)=200 : 25
12-36:y = 8
36:y = 12 - 8
36:y = 4
y = 36 : 4
y = 9
25 x (12-36:y)=200
12-36:y =200 : 25
12-36:y=8
36:y=12-8
36:y=4
y =36:4
y =9