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Verified answer
1=2+x2=x+3
3=a-5
4=4-n
5=x+1
6=z-10
7=x.y
8=2(a+b)
9=2a+b
10=5x
11=k+1
12=x+y
13=n+10
14=a+3
15=a-2
16=m.n
17=x-1
18=a/b
Suerte!