Explicación paso a paso:
x-14+x=56
x+x=14+56
2x=70
x= 70/2
x= 35
ahora sustituye
35-14+35= 56
21+35=56
56=56
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Explicación paso a paso:
x-14+x=56
x+x=14+56
2x=70
x= 70/2
x= 35
ahora sustituye
35-14+35= 56
21+35=56
56=56