解方程:
7x-2.5x+3x-1.5x=15×4-6×3
(7-2.5+3-1.5)x=60-18
6x=42
x=7
x/ 2+3/2x=7
(1/2+3/2)x=7
2x=7
x=3.5
6x-7=4x-5
6x-4x=7-5
2x=2
x=1
6(1/2-4)+2x=7-(1/3x-1)
6×1/2-6×4+2x=7-1/3x+1
3-24+2x=8-1/3x
2x-21=8-1/3x
5/3x=29
x=17.4
5x-1/4=(3x+1)/2-(2-x)/3
5x-1/4=3/2x+1/2-2/3+1/3x
5x-1/4=4/3x-1/6
5x-4/3x=1/4-1/6
11/3x=1/12
x=3/132
(3x+2)/2-1=(2x-1)/4-(2x+1)/5
3/2x+1-1=1/2x-1/4-2/5x-1/5
3/2x=1/10x-9/20
1/10x-3/2x=9/20
-7/5x=9/20
x=-9/28