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## Transcript

### Problem solving

Step 6

Step 5

Step 4

Step 3

Step 2

Step 1

Index

#### When seven times a certain number is subtracted from 15, the result is -4.Find the number.

01

Decide the unknown quantity and allocate a pronumeral

### Let x be the number

Decide which operations are involved

02

### We explain the equation

03

Translate the problem into a linear equation by isolating the pronumeral

### Transform in a linear equation

04

Solve the linear equation by isolating the pronumeral

### Solve the equation

05

Check that the result does solve the initial problem

### Check the result

06

Write your answer in sentence form. Remember, there is usually no pronumeral in the original problem

### The number is 19/7 because :15 - 7 * 19/7 = -4

Exemple

07

Write your answer in sentence form. Remember, there is usually no pronumeral in the original problem

### 32/4+2x = 138/38+2x = 362x = 36-82x = 282x/2 = 28/2x = 14

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