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(Propiedad Conmutativa)
5x-2x= 4+8
3x= 12
x= 12/3
x= 4
Comprobación:
Sustituyimos el valor de "x" como 4:
5(4)-8= 2(4)+4
20-8= 8+4
12= 12
Saludos;
5x-2x=4+8
3x=12
x=12\3
x=4