5x-a=14 2(5x+a)=3(a-x)+12a 8:3=4x:7 2x:3=6:

题目

5x-a=14 2(5x+a)=3(a-x)+12a 8:3=4x:7 2x:3=6:

答案

5x-a=14
x=(a+14)/5
2(5x+a)=3(a-X)+12a
10x+2a=3a-3x+12a
13x=7a
x=7a/13
8/3=4x/7
12x=56
x=14/3
2x/3=6/5
10x=18
x=1.8