Упрощение выражений:

1. 3(x+3)-3(4-x)-x-3 = 3x + 9 - 12 + 3x - x - 3 = (3x + 3x - x) + (9 - 12 - 3) = 5x - 6
2. 3(y+5)-(4-y) - 4y-3 = 3y + 15 - 4 + y - 4y - 3 = (3y + y - 4y) + (15 - 4 - 3) = 0y + 8 = 8
3. 2(b+4)-3(2-b) - b-4 = 2b + 8 - 6 + 3b - b - 4 = (2b + 3b - b) + (8 - 6 - 4) = 4b - 2
4. k+1-5(2-k) - 6k -5 = k + 1 - 10 + 5k - 6k - 5 = (k + 5k - 6k) + (1 - 10 - 5) = 0k - 14 = -14
5. m + 3-(2-m) -m-4 = m + 3 - 2 + m - m - 4 = (m + m - m) + (3 - 2 - 4) = m - 3
6. 4(f+3)-(5-f) - f-4 = 4f + 12 - 5 + f - f - 4 = (4f + f - f) + (12 - 5 - 4) = 4f + 3
7. 3(d+3)-4(1 – d) – 7d-1 = 3d + 9 - 4 + 4d - 7d - 1 = (3d + 4d - 7d) + (9 - 4 - 1) = 0d + 4 = 4
8. 5(a+5)-3(3-a)-a-3 = 5a + 25 - 9 + 3a - a - 3 = (5a + 3a - a) + (25 - 9 - 3) = 7a + 13
9. 2(t+2)-5(2-t)-7t-1 = 2t + 4 - 10 + 5t - 7t - 1 = (2t + 5t - 7t) + (4 - 10 - 1) = 0t - 7 = -7
10. 2(n+4)-4(5-n) - 6n-3 = 2n + 8 - 20 + 4n - 6n - 3 = (2n + 4n - 6n) + (8 - 20 - 3) = 0n - 15 = -15

1. 5x - 6
2. 8
3. 4b - 2
4. -14
5. m - 3
6. 4f + 3
7. 4
8. 7a + 13
9. -7
10. -15