Answer: 
Step-by-step explanation:
Given the equation 
you need to solve for the variable "b".
You need to apply Distributive property on both sides of the equation:
Now you need to add 21 to both sides of the equation:
Subtract 
from both sides:
And finally, you can divide both sides of the equation by 18:
Isnt it 2.5 and ur welcome
<span>
<u><em>First, we need to get the amount of change:</em></u>The amount of change can either be an increase or a decrease.
It can be calculated as follows:
amount of change = </span>
<span>
If the amount of change is positive, then it is an increase
If the amount of change is negative, then it is a decrease
<u><em>Then, we need to convert this amount into a percentage:</em></u>Changing the amount into a percentage can simply be done by multiplying this amount by 100
This means that:
% of change = amount of change * 100
<u><em>Combining the two steps:</em></u>% of change = </span>
<span> * 100
<u>Examples:</u>The original price of a certain product was $10. It then became $12. Find the % of increase.
% of change = </span>
<span> = 20%
This means that the price increased by 20%
The temperature decreased from 25 degrees to 20 degrees. Find the percentage of decrease.
% of decrease = </span>
<span> = -20%
This means that the temperature decreased by 20%
Hope this helps :)</span>
Divide both sides by -2
two negatives make a positive and that's true so x = 16/2 so divide it
x = 8 because 2 x 8 = 16 and 2/16 = 8 so true.
Answer: x = 8.
