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b)-9x+9x = 0
c)13a-ab-4b
d)0
e)-13m+7n-6
f)-30z
Desarrollo:
d) +a-a=0
+b-b=0
-c-c=2c. 2c-2c=0
e) -6m-m-6m=13m
-8n+n=7n
+5-11=6
f)+80x+x=81x. -81x+81x=0
+19y+6y==25y. -25y+25y=0
0+0+30z=30z