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-3m + 13m
= 10m
2. 13x + 5x - 18x + 4x
13x + 5x - 18x + 4x
= 18x - 18x + 4x
= 4x
3.
=
= 0
4.
=
5. -7t + 4b - 2 + 5 - 2b + 9
-7t + 4b - 2 + 5 - 2b + 9
= -7t + 4b - 2b - 2 + 5 + 9
= -7t + 2b + 12
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