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Respuesta:
7x-12=30
7x=30+12
x=42
7
x=6
5x-18=77
5x=77+18
x=95
5
x=19
8x+12=36
8x=36-12
x=24
8
x=3
x+45=72
x=72-45
x=27
x
X=27
Respuesta:
Explicación paso a paso:
7x-12=30
7x=30+12
x=42
7
x=6
5x-18=77
5x=77+18
x=95
5
x=19
8x+12=36
8x=36-12
x=24
8
x=3
x+45=72
x=72-45
x=27
x
X=27