Answer:
x = -13
Step-by-step explanation:
Distribute:
8 - 6x + 10x - 15 = 20 - 5x
Combine like terms:
4x - 7 = 20 - 5x
Isolate Variable
-x = 13
-1(-x) = -1(13)
You need to apply Distributive property on the left side of the equation:
Now you must add the like terms on the left side of the equation:
Add to both sides:
Add 7 to boht sides of the equation:
And finally, divide both sides by 9:
D
The answer is that it's a right triangle. One angle is 90°