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5x=140
x=140/5
x= 28
SALUDOS :D
2x-1+3x+1=140
5x=140
x=140/5
x=28
prueba
2x-1+3x+1=140
2(28)-1+3(28)+1=140
56-1+84+1=140
56+84=140
140=140
saludos