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2x-x=8+1
X=9
2) 7x+9=57-x
7x+x=57-9
8x= 48
x=6
3) 9-(6x-8)=7-(x+10)
9-6x+8=7-x-10
-6x+x=7-10-9-8
-5x=-20
x= 4
Espero que te sea de utilidad no te olvides de calificar