N 462) а) (х+27)-12=42 б) 115-(35+у)=39

Question

N 462) а) (х+27)-12=42
б) 115-(35+у)=39

Answer 1

А)x+27-12=42
x=42-27+12
x=27

б) 115-35-y=39
-y=39+35-115
-y=-41 (*-1)
y=41