Simplify the following expression:
-8x + 4x

• -12x
• -4x
• 4x
• 12x

Simplify the following expression:
(5 + 4x) + (2x - 8)

• 13 + 6x
• 6x - 3
• 6x - 13
• 6x + 3

Find the sum (−x + 8) + (−5x − 1).

• −6x + 7
• −4x + 7
• −6x − 8
• −6x + 8

(-m + 3) + (7m – 1)

• -8m + 2
• 6m + 2
• -8m + 4
• -6m + 2

Find the sum:
(7k + 9) + (4k - 3)

• 3k + 6 
• 11k + 6
• -11k + 6
• - 3k + 6

Find the sum (−3x + 7) + (2x − 5).

• −x + 2
• −6x − 35
• −x - 2
• −5x + 2

(3x + 5) + (2x + 1) 

• 5x + 5
• 5x + 6
• x + 4
• 6x + 5

Find the difference:
(8 - u) - (5u + 1)

• 6u + 7 
• -4u + 7
• -6u + 7
• 4u - 7

(-11a + 7) – (11a – 7)

• -22a - 14
• 0
• -22a + 14
• -22a 

(7a + 4) - (9a + 2)

• -2a + 6
• 2a + 6
• -2a + 2
• 2a + 2