1) x-7= 2x+8

2) 3(x+5)+ 2(x+1)=15

3) 3a +4b =17
9b+12b=?

4) x-y=1
5x-5y =?

5)x/y = 3/5; a/b= 2/4

y/x+b/a=?

6)y-2=m; x+2= n
x+y=?

7) x- 2/3= 5

8) 1/7 +y =3

.9) 2x+1 = x+1

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