1) x + 215 = 612;
x = 612 - 215;
x = 397;
2) 500 - x = 346;
x = 500 - 346;
x = 151;
3) x - 485 = 197;
x = 197 + 485;
x = 682.
1) x + 215 = 612;
x = 612 - 215;
x = 397;
2) 500 - x = 346;
x = 500 - 346;
x = 151;
3) x - 485 = 197;
x = 197 + 485;
x = 682.