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b)=x+2
c)=x+4
d= x+6
e)=x+8
x+ x+2 +x+4 +X+6+x+8=40
5x= 40-2-4-6-8
x =20/5
x=4
a)=4
b)= 4+2 =6
c)= 4+4=8
d)= 4+6= 10
e)= 4+8= 12
4+6+8+10+12=40