Question

Rewrite the expression 7x+21=

Answer 1

You must find the factors of 7 and 21. Which is 7.

7(x+3)

And that's one way to rewrite this expression :)

Answer 2

Minus the 21 from the other side of the equation making it 7x=-21 then u divide the 7 from the x to the -21 resulting in x=-3