Question

4-5x=x-0.2

Answer 1

解：解方程, 此方程的解为x = 7/10，【即x = 0.7】
4 - 5x = x - 0.2
x + 5x = 4 + 0.2
6x = 4 + 2/10
6x = 40/10 + 2/10
6x = 42/10
6x = 21/5
x = 21/5 ÷ 6
x = 21/5 × 1/6
x = 7/10
∴x = 0.7
答：此方程的解为x = 7/10，【即x = 0.7】

Answer 2

解：由已知5x - 5x*0.2 = 4/5，所以5x - x = 4/5，合并可得4x = 4/5，解得x = 1/5 ；综上所述，原方程的解为 x = 1/5 。

Answer 3

等式两边同时加上5x
即4=6x-0.2
再同时加上0.2
4.2=6x
x=0.7
解得x=0.7

Answer 4

4-5X=X-0.2
4+0.2=X+5X
4.2=6X
X=4.2÷6=0.7

Answer 5

首先移项，得6x=4.2
两边同时除以6，得x=0.7