Given m∠5 = (125 − x )° and m∠8 = (−10 − 28 x)°, find m∠7 .
5 and 8 are equal
125-x = -10-28x solve for x
then agle 5 = 125-x
and angle 5 and angle 7 sum to 180o
125-x + angle7 = 180
+37146 
