I assume you're looking for n.
so, take 2n/10-3n/10=2/10. Making everything have the same denominator is always easier.
This way, you have -n/10=2/10.
n=-2.
Answer:
or 
Step-by-step explanation:
To find slope we use the slope formula

Two points on the line we can classify are (3,4) and (4,8)
The number of people who voted follows a binomial distribution with probability of having voted

and

subjects, which means the approximating normal distribution should have mean

and standard deviation

.
With the continuity correction, you have