Question

What is the value of x?

Answer 1

These 2 angles add up to 180 so
(10x-20)+(6x+8)=180
First combine like terms
10x+6x=16x
-20+8=-12
So
16x-12=180
we then want to get x on the side by itself.
So we'll add 12 to both sides, the equation is now
16x=192
Then divide 192/16x=12

so x=12