The teacher will be very surprised to see your correct solution 😉
352 523 1003 --- + - --- + x = ---- 25 10 1000
(352/25)-((523/10)-x) = (1003/1000)
352/25-523/10-x) = (1003/1000)
352/25-523/10-x) = 1003/1000
-1911/50 + x = 1003/1000
sum
39223 ----- 1000
=
39223 ----- 1000
product
39223 ----- 1000
=
39223 ----- 1000
39223/1000