a) x + 27 - 12 = 42x + 15 = 42x = 42 - 15x = 27
б) 115 - (35 + y) = 39115 - 35 - y = 3980 - y = 39-y = 39 - 80-y = -41y = 41
в) z - 35 - 64 = 16z - 99 = 16z = 16 + 99z = 115
г) 28 - t + 35 = 5363 - t = 53-t = 53 - 63-t = -10t = 10
a) x + 27 - 12 = 42
x + 15 = 42
x = 42 - 15
x = 27
б) 115 - (35 + y) = 39
115 - 35 - y = 39
80 - y = 39
-y = 39 - 80
-y = -41
y = 41
в) z - 35 - 64 = 16
z - 99 = 16
z = 16 + 99
z = 115
г) 28 - t + 35 = 53
63 - t = 53
-t = 53 - 63
-t = -10
t = 10