What is the value of n?
40= -5n/8
n=

40 = -5 × 

First, simplify 5 ×  to  / Your problem should look like: 40 = 
Second, multiply both sides by 8. / Your problem should look like: 320 = -5n
Third, divide both sides by -5. / Your problem should look like:  = n
Fourth, simplify  to  / Your problem should look like:  = n
Fifth, simplify  to 64. / Your problem should look like: -64 = n
Sixth, switch sides. / Your problem should look like: n = -64

 n = -64

40 & 50 in the right corner are the complementary angles as when placed in a sum (added together) they make 90°