Explicación paso a paso:
7X-2X+X=20
6X=20
X=20
6
X=10
3
8X-5X=13+5
3X=18
X=18
X=6
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Explicación paso a paso:
7X-2X+X=20
6X=20
X=20
6
X=10
3
8X-5X=13+5
3X=18
X=18
3
X=6