Question

a/x +1/x=b
1/x-b/x=a

Answer 1

a/x +1/x=b

(a+1):x=b

a+1= b.x

a=bx-1

el otro

1/x-b/x=a

(1-b):x=a

1-b=a.x

-b =ax-1

b=ax+1