Respuesta:
3x-63=72
3x=72-63
3x=9
X=9÷3
X=3
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Respuesta:
3x-63=72
3x=72-63
3x=9
X=9÷3
X=3
3x-63=72
3x=72+63
X= 72 +63 sobre 3
X=45