Решите уравнения двумя способами, (х +27) -12=42 ,115- (35+ у)=39

(х +27) -12=42 (х +27) -12=42x-27-12=42 x-27-12=42x=42+27+12 x-39=42x=81 x=42+39 x=81115- (35+ у)=39 115- (35+ у)=39115-35-y=39 115-35-y=39-y=39-115+35 80-y=39-y=-41 -y=39-80y=-41-1) -y=-41y=41 y=-41-1) y=41