Answer:
x = -7
Step-by-step explanation:
sum of interior angles in any triangle 180°
84 + 59 + 51 = 194
180 - 194 = -14
14 ÷ 2 = -7 x = -7
check
-7 + 59 = 52
-7 + 51 = 44
84 + 52 + 44 = 180
