(х+7)-12=42
x + 7 – 12 = 42
x = 42 + 12 – 7
x = 47
115-(35+у)=39
115 – 35 – y = 39
– y = 39 + 35 – 115
y = 41
z-35-64=16
z = 16 + 64 + 35
z = 115
28-t+35=53
28 – 1t + 35 = 53
– t = 53 – 35 – 28
-t = -10
t = 10
(х+7)-12=42
x + 7 – 12 = 42
x = 42 + 12 – 7
x = 47
115-(35+у)=39
115 – 35 – y = 39
– y = 39 + 35 – 115
y = 41
z-35-64=16
z = 16 + 64 + 35
z = 115
28-t+35=53
28 – 1t + 35 = 53
– t = 53 – 35 – 28
-t = -10
t = 10