5x+3x=5x+15/2 what value 3x make the equation true

We need to get the 3x alone so

5X+3X=5X+15:2

(:5x) 3X=5X+7.5 (:5X)

(:3) X=7.5 (:3)

X=7.5:3

X=2. s

Subtract 5x from both sides. You'll get 3x=15/2

Turn 15/2 into a mixed number. 7 1/2

Divide 3 both sides.

Answer: 2 1/2

Check your work.

5*2 1/2 = 12.5 3*2 1/2 = 7.5

Therefore 12.5+7.5=12.5+7.5

12.5+7.5=20

Therefore the answer is 2.5 or 2 1/2