Answer:

22.5

Step-by-step explanation:

3tan(x-15)=tan(x+15)

3 tan =0.05, tan =0.01

0.05(x-15)=0.01(x+15)

0.05x-0.75=0.01x+0.15

0.05x-0.01x=0.15+0.75

0.04x=0.9

x=0.9÷0.04

x=22.5