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número b = x+2
x+x+2= 28
2x=28-2
x= 26/2
x=13
número a=13
número b= 13+2=15
2x+3
resolver la ecuacion
2x+1+2x+3 = 28
4x = 24
x = 6
2x+1 = 13
2x + 3 = 15
13+15 = 28