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6x=18
x=3
entonces
2x=6
2X+1=7
2X+2=8
2x+2x+1+2x+2=21
6x+3=21
x= 3
Entonces:
2x=6
2x+1=7
2x+2=8
y eso son las respuesta como te dije 6, 7 y 8