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3x-2x=4
1x=4
x=4/1
x=4
x+5= 9
Propiedad Conmutativa:
x= 9-5
x= 4
Comprobación:
Sustitución el valor de x:
2(4)+4-2(4)+5= 9
8+4-8+5= 9
12-8+5= 9
4+5= 9
9= 9
Saludos!