What's the value of x?

42 + 12x - 4 = 17x + 8​

Step-by-step explanation:

12x - 17x = 8 + 4 - 42

-5x = -30

x = 6

you cant answer this dummy

step-by-step explanation:

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.