Question

21/80-3x/30+3 6/30=2 15/30

Answer 1

Ответ:

Пошаговое объяснение:

21/80-3x/30+3 6/30=2 15/30

21/80- 3х/30=2 15/30-3 6/30

21/80 -3х/30= - 7/10

-3х/30= -21/80-7/10

-х/10= -77/80

х=77/80*10

х=77/8

х=9 5/8

Answer 2

Let's simplify the expression step by step:

1. Start with the fractions:

   • 21/80 - (3x/30) + 36/30 = 215/30

2. Find a common denominator for the fractions on the left side. The common denominator is 80, so we need to adjust the fractions:

   • (21/80) - (8x/80) + (1920/80) = 215/30

3. Now that the fractions on the left side have the same denominator, we can combine them:

   • (21 - 8x + 1920)/80 = 215/30

4. Combine the numerators on the left side:

   • (21 - 8x + 1920)/80 = 215/30

5. Multiply both sides by 80 to get rid of the denominator on the left side:

   • 21 - 8x + 1920 = (215/30) * 80

6. Simplify the right side:

   • 21 - 8x + 1920 = 17 * 80

7. Subtract 21 and 1920 from both sides to isolate -8x on the left side:

   • 8x = (17 * 80) - 21 - 1920

8. Calculate the right side:

   • 8x = 1360 - 21 - 1920

9. Continue to simplify:

   • 8x = -581

10. Finally, divide both sides by -8 to solve for x:

• x = (-581) / (-8)

Now, divide -581 by -8:

• x = 72.625

So, the solution to the equation is: x ≈ 72.625