Explicación paso a paso:
3x + 12 = 42
3x = 42 - 12
3x = 30
x = [tex]\frac{30}{3}[/tex]
x = 10
:)
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Explicación paso a paso:
3x + 12 = 42
3x = 42 - 12
3x = 30
x = [tex]\frac{30}{3}[/tex]
x = 10
:)