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I am still confused. I am sorry

ok so you're trying to translate this word problem into two equations

or in other words, y = x + 7, with y being the second number, and x being the first

so x + y = 47, substituing x + 7 for y, we get x + x + 7 = 40

errr sorry, x + (x + 7) = 47

if you keep solving this, then we see that 2x + 7 = 47 , 2x = 40, x = 20

ok, so now we KNOW x=20

and then we substitute it back into either of our equations

so since x + y = 47, and we know x = 20, we see 20 + y = 47

and then y = 27

does that make more sense?

ok so we had 2x + 7 = 47

we need to subtract 7 from both sides

so 2x = 40

and now we divide each side by 2

so x=20

ok. so we sub. 7 to get X by itself?

exactly

and this property holds true for any operation on equal values (the two sides of an equation)

as long as I do the same operation to both sides, I know they're still equal

can i post another one? I will try and work on it and see if i get it right?

ok sure

do i post here or on the left?

on the left =)