Explicación paso a paso:
Es la b:
3x+1 = 7
3x = 7-1
3x = 6
x = 6/3
x = 2
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Verified answer
Explicación paso a paso:
Es la b:
3x+1 = 7
3x = 7-1
3x = 6
x = 6/3
x = 2