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andreyandreev [35.5K]
2 years ago
7

7 times a certain number is decreased by 8 and the result is equals to 20​

Mathematics
2 answers:
Andrews [41]2 years ago
5 0

Answer:

let x represent the number

7x-8=20

7x=20+8

7x=28

x=28/7

x=4

this is the correct answer

-Dominant- [34]2 years ago
4 0

Answer:

7x-8=20         or          x=4

Step-by-step explanation:

Let's say the certain number is x

7x-8=20

Add 8 on both sides:

7x-8+8=20+8

Simplify:

7x=28

Divide 7 on both sides:

\frac{7x}{7}=\frac{28}{7}

Simplify:

x=4

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