2x+x12=42
3x=42-12
3x=30
x=30:3
x=10
reemplazamos:
2.10+10+12=42
Marcela=32 años
Alfonso=10años
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2x+x12=42
3x=42-12
3x=30
x=30:3
x=10
reemplazamos:
2.10+10+12=42
Marcela=32 años
Alfonso=10años