Question

13x-11 +18x15+ 4x+1=180°

Answer 1

x = - 80/17, or x = - 4
`(12)/(17)`

Explanation:

13x-11 +18×15+ 4x+1=180°

<=> (13x + 4x) + (18×15+ 1 - 11)=180°

<=> 17x + 260 =180

<=> 17x = 180 - 260

<=> 17x = - 80

<=> x = - 80/17

<=> x = - 4
`(12)/(17)`