x = -4
step-by-step explanation:
- 20 - 4(x + 3) = 4x
=> -20 - 4x - 12 = 4x
=> - 32 -4x = 4x
=> -32 = 4x + 4x
=> - 32 = 8x
=> -32/8 = x
=> -4 = x
i dont know the answer but here's a picture of a dog
180°
sum of equilateral triangle=180°
< n=60°
< m=120°°[angle supplementary of equilateral angle]
< m+< r+< x=360°(sum of exterior angle of triangle)