а) (x+27)-12=42x + 27 - 12 = 42x + 15 = 42x = 42 - 15x = 27
б) 115 - (35 + y) = 39115 - 35 - y = 3980 - y = 39-y = 39 - 80-y = -41y = 41
Ответ: а) x = 27; б) y = 41.
а) (x+27)-12=42
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
Ответ: а) x = 27; б) y = 41.