Respuesta:
x+10+2x+20=90
3x+30=90
3x=60
x=20
2x+20+x+10=90
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Verified answer
Respuesta:
x+10+2x+20=90
3x+30=90
3x=60
x=20
2x+20+x+10=90
3x+30=90
3x=60
x=20
♡espero te sirva