5,01
3x + 4,2 = 19,25
3x = 19,25 - 4,2
x = 15,05 ÷ 3
x = 5.01
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Respuesta:
5,01
Explicación paso a paso:
3x + 4,2 = 19,25
3x = 19,25 - 4,2
x = 15,05 ÷ 3
x = 5.01