а)(х+27)-12=42
x + 27 – 12 = 42
x = 42 + 12 – 27
x = 27
б)115-(35+у)=39
115 – 35 – y = 39
– y = 39 + 35 – 115
-y = -41
y = 41
в)z-35-64=16
z = 16 + 64 + 35
z = 115
г)28-t+35=53
– t = 53 – 35 – 28
-t = -10
t = 10
а)(х+27)-12=42
x + 27 – 12 = 42
x = 42 + 12 – 27
x = 27
б)115-(35+у)=39
115 – 35 – y = 39
– y = 39 + 35 – 115
-y = -41
y = 41
в)z-35-64=16
z = 16 + 64 + 35
z = 115
г)28-t+35=53
– t = 53 – 35 – 28
-t = -10
t = 10