4x+12=3x+42
x=30
Explicación paso a paso:
4x+12-3x=42
4x-3x=42-12
x=42-12
= x=30
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4x+12=3x+42
x=30
Explicación paso a paso:
4x+12=3x+42
4x+12-3x=42
4x-3x=42-12
x=42-12
= x=30