Twice a number decreased by 4 is equal to the sum of 6 and the product of 3 and a number.
n - a number
[tex]2n-4=6+3n\qquad\text{add 4 to both sides}\\\\2n=10+3n\qquad\text{subtract 3n from both sides}\\\\-n=10\qquad\text{change the signs}\\\\\boxed{n=-10}[/tex]
