3) (131 - y) + 56 = 102
(131 - y) = 102 - 56
(131 - y) = 46
y = 131 - 46
y = 85
4) (y - 56) + 134 = 201
(y - 56) = 201 - 134
(y - 56) = 67
y = 67 + 56
y = 123
5) 372 - (x +205) = 149
(x + 205) = 372 - 149
(x + 205) = 223
x = 223 - 205
x = 18
6) 162 - (x - 15) = 37
(x - 15) = 162 - 37
(x - 15) = 125
x = 125 + 15
x = 140
7) (327 - x) - 83 = 159
(327 - x) = 159 + 83
(327 - x) = 242
x = 327 - 242
x = 85