(X-1)/0.2 -X/0.8 =10

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(X-1)/0.2-X/0.8=10(X-1)/0.2-X/0.8=10(X-1)/0.2-X/0.8=10(X-1)/0.2-X/0.8=105(X-1)-5X/4=10(X-1)-X/4=24(X

(X-1)/0.2 -X/0.8 =10
(X-1)/0.2 -X/0.8 =10

(X-1)/0.2 -X/0.8 =10
(X-1)/0.2 -X/0.8 =10
5(X-1) -5X/4 =10
(X-1) -X/4 =2
4(X-1) -X =8
4x-4-x=8
3x=12
x=4

4

4*(x-1)-x = 8
3x = 12
x =4

答案x=4