數學問題！！急

26. 2(4-2x)-15(2-x)=22
8-4x-30+15x =22
11x-22=22
11x=44
x=4
27. 5(0.4-3)+7(1.5x-7)+4=2.5x
2-15+10.5x-49+4=2.5x
-58+10.5x=2.5x
8x=58
x=7.25
28. 8[2(6x-4)-(4+3x)]=120+18x
8[12x-8-4-3x]=120+18x
96x-64-32-24x=120+18x
72x-96= 120+18x
54x=216
x=4

26) 2(4-2x)-15(2-x)=22
8-4x-30+15x=22
11x=22
x=4

27) 5(0.4-3)+7(1.5x-7)+4=2.5x
2-3+10.5x-49+4=2.5x
-46=-8x
x=5.75

28) 8[2(6x-4)-(4+3x)]=120+18x
8[12x-8-4-3x]=120+18x
96x-64-32-24x=120+18x
54x=216
x=4

29) 7x/4+1=9x/8+11
7x/4-9x/8=11-1
32(7x/4-9x/8)=32(11-1)
56x-36x=320
17x=320
x=320/17

30) x/3-20-x/7=10
21(x/3-20-x/7)=21(10)
7x-3(20-x)=210
7x-60+3x=210
10x=270
x=27

31) 2x-5/5+x+2/4=6
20(2x-5/5+x+2/4)=20(6)
4(2x-5)+5(x+2)=120
8x-20+5x+10=120
13x=130
x=13

32) 5x/3-2x+3/6=2/7-2x/3
42(5x/3-2x+3/6)=42(2/7-2x/3)
14(5x)-7(2x+3)=12-14(2x)
70x-14x-21=12-28x
84x=33
x=33/84 <-個答案好似唔係好岩

26. 2(4-2x)-15(2-x)=22
8-4x-30+15x =22
11x-22=22
11x=44
x=4
27. 5(0.4-3)+7(1.5x-7)+4=2.5x
2-15+10.5x-49+4=2.5x
-58+10.5x=2.5x
8x=58
x=7.25
28. 8[2(6x-4)-(4+3x)]=120+18x
8[12x-8-4-3x]=120+18x
96x-64-32-24x=120+18x
72x-96= 120+18x
54x=216
x=4