Explicación paso a paso:
1.
x-20=15
x=15+20
x=35
2.
2x+5=25
2x=25-5
2x=20
x=20/2
x=10/1
x=10
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Explicación paso a paso:
1.
x-20=15
x=15+20
x=35
2.
2x+5=25
2x=25-5
2x=20
x=20/2
x=10/1
x=10