How do I solve this equation?

Step-by-step explanation:

This is an inequality, not an equation.  There will be a set of x-values for which the inequality will be true.

First eliminate the fractional coefficient 2/5 by multiplying all terms by 5:

25 < 2x + 15 ≤ 75

Subtracting 15 from each 5, (2/5)x, 3 and 15 yields:

22 < 2x ≤ 60

Dividing all three terms by 2, we get:

11 < x ≤ 30

Thus, any number greater than 11 but equal to or less than 30 is a solution.

its a straight line parallel to the time axis

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.