Question

what is 1/3x-5=12

Answer 1

1/3x+5=12

subtract 5 from each side so you get

1/3x=7; now multiply by 3/1 to each side

(3/1)(1/3x)=7(3/1)

x=21

A=2r+8

subtract 8 from each side so you get

a-8=2r; now divide by 2 to isolate r so you get

a/2-4=r

Now this is the same as yours, just they used addition, so all you have to do is follow there steps, so for subtract, you would add 5 to each side