Answer:
Step-by-step explanation:
Total sum of degrees of a Triangle is 180 deg
Than: 8x-7 + x +7 + 2x + 15 = 180
11x + 15 = 180
x = (180-15) / 11 =15
Answer: 15
Answer:
Step-by-step explanation:
Answer:
Any value you choose for x will make the equation a TRUE statement. This type of equation is called an identity, and the solution set is all real numbers.
Answer:
the Commutative Property of Addition