What is the main purpose of goal in our life ?​

Setting goals helps trigger new behaviors, helps guides your focus and helps you sustain that momentum in life. Goals also help align your focus and promote a sense of self-mastery. In the end, you can't manage what you don't measure and you can't improve upon something that you don't properly manage.

if triangle abc is congruent to triangle def, their interior angles are congruent, because congruent parts of congruent triangles are congruent (cpctc).

that means ∠d is congruent to ∠a; ∠d is equal to 8x - 2.

interior angles of all triangles add to equal 180 degrees, so you can set the sum of these interior angle values equal to 180 and solve for x.

180 = (8x - 2) + 22 + 72

180 = 8x - 2 + 22 + 72

180 = 8x + 92

88 = 8x

11 = x

x = 11