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X= 9+8
X= 17
17-8= 9
b) 8X+3=11
8X= 11-3
8X= 8
X= 8/8
X=1
8por1+3= 11
c)5X= X+4
5X-X= 4
4X= 4
X= 4/4
X= 1
5por1= 1+4
d) 2X+3=7
2X= 7-3
2X= 4
X= 4/2
X= 2
2por2+3= 7