You scrambled up a Rubik's cube, and now you want to put it back in order. What sequence of moves should you make?

Substitute close substituteIn algebra, to replace a letter with a number. the value of 𝑥 back into the original equation to check the answer is correct.

Algebra is all ... used letters are 𝑥 and 𝑦. Image caption, You can think of an equation like a set of scales. Both sides of the equals sign must have the same value to be balanced.