Question

the measure of angle if seven times its complement is 10° less than three times its supplement

Answer 1

let the angle be x

measure of its complement = (90-x)

measure of its supplement= (180-x)

7(90-x) =3(180-x)-10

630 - 7x=540x-3x -10

-7x+3x= 530-630

-4x=-100

x= 100/4

x=25