Математика(45-у)×3=12×12

Question

Математика(45-у)×3=12×12

Answer 1

(45-у)х3=144
45-у=48
у=-3

Answer 2

(45-у)×3=144
(45-у)=144:3
(45-у)=48
-у=48-45
-у=3
у=-3