Question 1175629
First angle = 90
Second angle = x
Third angle = 90 - x
<pr>
x = 7(90 - x) - 6
<pr>
x + 6 = 7(90 - x)
<pr>
x + 6 = 630 - 7x
<pr>
8x = 624
<pr>
x = 78
<pr>
First angle = <b>90</b>
Second angle = x = <b>78</b>
Third angle = 90 - x = 90 - 78 = <b>12</b>