[quote=butzie;2197326]Well put! I aced calculus, so read on only if you'd like.

You are not just doing arithmetic but solving for x. For example:

7x-5 = 15 + 4x -5

7x - 5 +5 = 15 + 4x

7x = 15 + 4x

7x - 4x = 15

3x = 15

x = 5

I found a website last night that offered practice with these equations. It took me a minute to figure them out. It's really hard.

You are not just doing arithmetic but solving for x. For example:

7x-5 = 15 + 4x -5

7x - 5 +5 = 15 + 4x

7x = 15 + 4x

7x - 4x = 15

3x = 15

x = 5

I found a website last night that offered practice with these equations. It took me a minute to figure them out. It's really hard.