Respuesta:
4(5x+2)-9=39
20x+8-9=39
20x-1=39
20x=39+1
20x=40
x=40/20
x=2
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Respuesta:
4(5x+2)-9=39
20x+8-9=39
20x-1=39
20x=39+1
20x=40
x=40/20
x=2