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-11+6-4
-15+6
-9
b) x+10=15x-20
x-15x = -20-10
-14x = -30
x = -30/-14
x = 30/14 = 15/7
c) x-1=18+2x
x-2x = 18 +1
-x = 19
x = -19
d) 2x+5=x+10
2x-x = 10-5
x = 5
e) ¿Cuantos multiplos de 10 de 2 cifras exactas hay?
10,20,30,40,50,60,70,80,90
hay 9
.............Kd