## Elementary Algebra

$-0.1x$
Using the distributive property, the given expression simplifies to: $0.4x-0.7x-0.8x+x$ =$x(0.4-0.7-0.8+1)$ =$x(0.4-0.7-0.8+1)$ =$x(-0.1)$ =$-0.1x$