Answer: x=10
Explanation:
sum of all the angles inside triangle is equal to 180degrees.
First angle: 9x-16
Second angle: 7x-5
Third angle: 3x+11
let's sum this angles:
9x-16+7x-5+3x+11=19x-10=180
19x=180+10=190
x=190/19=10
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