138 + 1x + 57 = 218
x = 218 – 57 – 138
x = 23
248-(y+123)=24
248 – y – 123 = 24
– y = 24 + 123 – 248
-y = -101
y = 101
(24-x)+37=49
24 – x + 37 = 49
– x = 49 – 37 – 24
-x = -12
x = 12
169+(87+n)=303
169 + 87 + n = 303
n = 303 – 87 – 169
n = 47
138 + 1x + 57 = 218
x = 218 – 57 – 138
x = 23
248-(y+123)=24
248 – y – 123 = 24
– y = 24 + 123 – 248
-y = -101
y = 101
(24-x)+37=49
24 – x + 37 = 49
– x = 49 – 37 – 24
-x = -12
x = 12
169+(87+n)=303
169 + 87 + n = 303
n = 303 – 87 – 169
n = 47