Verified answer

Well you would begin with adding 15 to each side

8x -15 + 5 X=-80

+15......... +15

That gives you

8X + 5 X=-65

So

13X=-65

Now divide both sides by 13

13x/13= -65/13

and so

X= -5

Brooke - you should be able to do this. Here's how.

8x-15+5x=-80 is the same as 8x+5x=-80+15 which is the same as 8x+5x=-65which is the same as 13x=-65 which is the same as x=-65/13 which is the same as x=-5. Look at each step and see what is different. You are just rearranging the whole thing piece by piece until it is just x=something

8x – 15 + 5x = -80

Collect like-terms at the left hand side of the equation above, i.e.

8x + 5x - 15 = -80

(8+5)x - 15 = -80

13x - 15 = -80

Add 15 to both sides of the equation above, i.e.

13x - 15 + 15 = -80 + 15

13x = -65

Divide both sides by 13, i.e.

13x/13 = -65/13

x = -5 ...Ans

8x + 5x = -80 +15

13x = -65

x = -65 ÷ 13

x = -5

8x + 5x = -80 + 15

13x = -65

x = -65/13 = -5

8x + 5x = -80 + 15

13x = -65

13x/13 = -65/13

x = -5

8x-15+5x+80=0

13x-15+80=0

13x+65=0

13x=-65

x=-5

check your answer by inserting -5 for x. It checks out.

8x-15+5x=-80

this can be simplified to

13x-15=-80

+ 15 to both sides of the equation and you get

13x=-65

divide both sides by 13 and u get

x=-5

8x - 15 + 5x = - 80

13x - 15 = - 80

13x = - 65

x = - 5.

13x=-65

x=-5