+ 
- (remove 2 red bars) = + 
+ 
- (remove 2 long bars) + = + 
+ 
- (remove 3 blue bars) - (remove 1 yellow bar) =
+ + + - (remove a blue bar) + = + + + + Next is using both addition and subtraction:
| 3x + 2y2 - 2x = | x + 2y2 |
| + - (remove 2 red bars) = |
+ |
| 4z3 + 3z2 - 2z3 + z2 = | 2z3 + 4z2 |
| + - (remove 2 long bars) + = |
+ |
| 3y3 + 2z - 3y3 - z = | z |
| + - (remove 3 blue bars) - (remove 1 yellow bar) = |
|
| x3 + 3y2 + 3z3 + 4x - y2 + 3z = | 4x + x3 + 2y2 + 3z + 3z3 |
| + + + - (remove a blue bar) + = |
+ + + + |
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© 2003 - 2005 by Charlotte Meyer