방정식 을 풀다 x - 0.8x = 60 12.4 (x - 2.6) = 6.2
1. x - 0.8x = 60
x (1 - 0.8) = 60
0.2x = 60
x = 300
2. 12.4x - 12.4 * 2.6 = 6.2
12.4x = 38.44
x = 3.1
1. x - 0.8x = 60
x (1 - 0.8) = 60
0.2x = 60
x = 300
2. 12.4x - 12.4 * 2.6 = 6.2
12.4x = 38.44
x = 3.1