2/3x-4 =20 what do i do with the 2 over 3?

I believe you mulitply by 2/3 on both sides to undo the divison

Hope this helps :)

Any time you have a number right beside a variable you always times them but for that reason you don’t knwo what x is so you would cancel out the -4 to the 20 then you would get that answer then that answer you get is the answer for x

Step-by-step explanation:

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is: