assuming you want us to solve for x
remember that you can do anything to an equation as long as you do it to both sides
18x+20+x=10x-3
combine like terms
19x+20=10x-3
minus 10x from both sides
19x-10x+20=10x-10x-3
9x+20=0-3
9x+20=-3
minus 20 from both sides
9x+20-20=-3-20
9x+0=-23
9x=-23
divide both sides by 9
[tex]\frac{9x}{9}=\frac{-23}{9}[/tex]
[tex]x(\frac{9}{9})=\frac{-23}{9}[/tex]
[tex]x(1)=\frac{-23}{9}[/tex]
[tex]x=\frac{-23}{9}[/tex]
