Question

(3x+15)°+(x+5)°=180°​

Answer 1

Step-by-step explanation:

4x+20=180

4x=180-20

4x=160

x=40°

Answer 2

$(3x + 15) + (x + 5) = 180 \\ = > 3x + 15 + x + 5 = 180 \\ = > 4x + 20 = 180 \\ = > 4x = 180 - 20 \\ = > 4x = 160 \\ x = \frac{160}{4} \\ = > x = 40$

plzz put the sign of degree (°)