Answer:
3d-7
Step-by-step explanation:
Let the first number be x
Then, second number = x+2d+5
Third number = x+2d+5−(3d−20) = x−d+25
Sum of the three numbers = x+x+2d+5+x−d+25 = 3x+d+30
Thus, 3x+d+30 = 10d+9
3x=10d+9−d−30 = 9d−21
x=3d−7
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Verified answer
Answer:
3d-7
Step-by-step explanation:
Let the first number be x
Then, second number = x+2d+5
Third number = x+2d+5−(3d−20) = x−d+25
Sum of the three numbers = x+x+2d+5+x−d+25 = 3x+d+30
Thus, 3x+d+30 = 10d+9
3x=10d+9−d−30 = 9d−21
x=3d−7
PLEASE MARK AS THE BRAINLIEST!!!