-28 = 118 + 210
31 + 199 = 750 - xx = 750 - (31 + 199)x = 750 - 230x = 520
374 - 148 = x + 81x = 374 - 148 - 81x = 226 - 81x = 145
-28 = 118 + 210
31 + 199 = 750 - x
x = 750 - (31 + 199)
x = 750 - 230
x = 520
374 - 148 = x + 81
x = 374 - 148 - 81
x = 226 - 81
x = 145