Answer:
x = 13
Step-by-step explanation:
All of the interior angles of a triangle add up to equal 180 degrees.
This means that if you set the expressions from your problem to equal 180, you'll get the value of x:
6x - 9 + 4x + 10 + 4x - 3 = 180 (original equation)
14x - 2 = 180 (combine like terms)
+2 +2 (add 2 to both sides)
14x = 182
x = 13 (divide both sides by 14)
