7x-9=19
Add 9 both sides
7x-9+9=9+19
7x=28
Divide both sides by 7
7x/7=28/7
Simplify
X= 4
To check substitute into original equation .
7(4)-9= 19
28-9= 19
19=19 it checks
x=4
19 plus 9 is 28
28 divide by 7 is 4
7 times 4 plus 9 is 19
