Answer:
1. x - 9
2. 3x - 2xy
3. 14t
4. -11x
5. -10xy
6. 15 - 20y
7. d + 6cd - 5c
8. ab - 2cd + cb
9. -20x
10. 7x + 25
11. 11k - 1
12. 5b - 8
Step-by-step explanation:
1.
[tex]-3(x + 3) + 4x = -3x - 9 + 4x = x - 9[/tex]
2.
[tex]xy + 4x - 3xy - x = 3x -2xy[/tex]
3.
[tex]4t + 10t = 14t[/tex]
4.
[tex]-10x - x = -11x[/tex]
5.
[tex]5(-2xy) = -10xy[/tex]
6.
[tex]6(-2y) - 9 + 4(-2y + 6) = -12y - 9 -8y + 24 = 15 - 20y[/tex]
7.
[tex]d + 3cd - 7c + 3cd + 2c = d + 6cd -5c[/tex]
8.
[tex]ab - 2ac + cb[/tex]
9.
[tex]-4(5x) = -20x[/tex]
10.
[tex]4 + 7(x + 3) = 4 + 7x + 21 = 7x + 25[/tex]
11.
[tex]-k + 3(4k - 1) + 2 = -k + 12k - 3 + 2 = 11k - 1[/tex]
12.
[tex]5(b - 4) + 12 = 5b - 20 + 12 = 5b - 8[/tex]
