Explicación paso a paso:
13.
0-25
-25
14.
[tex]-2a^{m+2}-6x^{m+3}+3+5x^{m+2}[/tex]
15.
3a + 3b - 3c
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Explicación paso a paso:
13.
0-25
-25
14.
[tex]-2a^{m+2}-6x^{m+3}+3+5x^{m+2}[/tex]
15.
3a + 3b - 3c