x = () 일 때, 7x - 8 은 5x + 2 식 과 같다. A. 0.5B. 5C. 0.2D. 2

x = () 일 때, 7x - 8 은 5x + 2 식 과 같다. A. 0.5B. 5C. 0.2D. 2


7x - 8 = 5x + 2 & nbsp; 7x - 8 + 8 = 5x + 2 + 8 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 7x = 5x + 10 & nbsp; & nbsp; 7x - 5x = 5x + 10 - 5x & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2x = 10 & nbsp; nbsp & nbsp; 2x / nbsp; 2x / nbsp; 2x 는 2 = 10 nb2 & nbsp; nbsp; nbsp & nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp & 5;



5X + 2 = 7X + 8 X =?
...


5X + 2 = 7X + 8X
5X + 2 = 15X
2 = 10 X
X = 0.2