1) 311 - (n + 86) = 311 - n - 86 = 311 - 86 - n = 225 - n;
n = 101;
225 - 101 = 124.
2) 44 + 81 +33 + x = 158 + 11 = 169.
1) 311 - (n + 86) = 311 - n - 86 = 311 - 86 - n = 225 - n;
n = 101;
225 - 101 = 124.
2) 44 + 81 +33 + x = 158 + 11 = 169.