2X-0.8X=16.8
解:(2-0.8)X=16.8
1.2X=16.8
X=16.8÷1.2
X=14
2x-0.8x=16.8
解:(2-0.8)x=16.8
1.2x=16.8
x=16.8÷1.2
x=14
2x-0.8x=16.8
1.2 x=16.8
x=1/14
解:解方程, 此方程的解为x = 14
2x - 0.8x = 16.8
2x - (8/10)x = (16×10+8)/10
2x - (4/5)x = 168/10
(10/5)x - (4/5)x = 84/5
(6/5)x = 84/5
x = 84/5 ÷ 6/5
x = 84/5 × 5/6
∴x = 14
答:此方程的解为x = 14