-6 is the answer hope this helps
ANSWER
12
EXPLANATION
Two expressions for the angles in terms of x are given,
The first one is (10x-20)°
The second one is (6x+8)°
The two angles are angles on a straight line.
The sum of angles on a straight line is 180°.
This implies that,

Group similar terms,

Combine like terms:


Therefore the value of x is 12
Answer:
It must be integer because all the - number (negative number) include in integer.
Is would be 5/20 and then simplified is 1/4
So in order to tell if something makes a right triangle we would use the formula Pythagorean theorem.a^2+b^2=c^2 and it must be equal and the same if not then those sides cant be use to make a right triangle
5^2+6^2=7^2
25+36=49
61=49
No ! False