Respuesta:
la 1: x= 84 -12
x=72,,
la 2: 4x -20=16
4x=20 + 16
4x= 36
x=36÷4
x=9,,
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Respuesta:
la 1: x= 84 -12
x=72,,
la 2: 4x -20=16
4x=20 + 16
4x= 36
x=36÷4
x=9,,