Explicación paso a paso:
X/6=2/3
12=3x
X=12/3=4
9x=3/5
45=3x
X=45/3=15
X/5=4/10
20=10x
X=20/10=2
6/x=3/15
90=3x
X=90/3=30
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Explicación paso a paso:
X/6=2/3
12=3x
X=12/3=4
9x=3/5
45=3x
X=45/3=15
X/5=4/10
20=10x
X=20/10=2
6/x=3/15
90=3x
X=90/3=30