Answer:
x=12
Explanation:
we know the sum of angles of a triangle=180
6x-19+3x+7+84=180
Step 1: Simplify both sides of the equation.
6x−19+3x+7+84=180
6x+−19+3x+7+84=180
(6x+3x)+(−19+7+84)=180(Combine Like Terms)
9x+72=180
9x+72=180
Step 2: Subtract 72 from both sides.
9x+72−72=180−72
9x=108
Step 3: Divide both sides by 9.
9x/9=108/9
x=12