Answer:
x = 15
Step-by-step explanation:
The two angles add to a straight line, so they add to 180
6x-5 + 6x+5 = 180
Combine like terms
12x = 180
Divide by 12
12x/12 =180/12
x =15
Two angles are supplementary and their sum is 180
6x + 5 + 6x - 5 = 180 add like terms
12x = 180 divide both sides by 12
