N+5(n-1)=7 help me i dont get it

]supplementary angles are two angles that add up to . • complementary angles are two angles that add up to degrees. • adjacent angles share a and a • congruent angles have the measure. • an triangle has one angle that is greater than 90 degrees. • a triangle with angles 45°, 45°, and 90° would be a triangle

50 points~ ! i have to turn this in tomarrow

Find the measure of the angle indicated in bold