## Introductory Algebra for College Students (7th Edition)

Both expressions have the same value, $28$. $9x-2x=7x$
Evaluating $9x-2x$ when $x=4:$ $9(4)-2(4)=36-8=28$ Evaluating $7x$ when $x=4:$ $7(4)=28.$ Our observations: Both expressions have the same value, $28$. $9x-2x=7x$