Explicación paso a paso:
2x+x-40 =90
3x=90+40
3x=130
X=130/3
X=43,33
Luego x+15=43,33+15=58,33
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Explicación paso a paso:
2x+x-40 =90
3x=90+40
3x=130
X=130/3
X=43,33
Luego x+15=43,33+15=58,33