Explicación paso a paso:
sea el número =x
x-3(6)=42
x-18= 42 pasamos18 con signo cambiado
x=42-18
x=24
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Explicación paso a paso:
sea el número =x
x-3(6)=42
x-18= 42 pasamos18 con signo cambiado
x=42-18
x=24