Solve -5(3 n + 4) = 40.

A: -4
B: 3
C: -3
D: 4

A: -4

Step-by-step explanation:

Expand first, "-5 x 3n = -15n" , "-5 x 4 = -20"

Then you have "-15n - 20 = 40"

Transfer the -20 to the RHS,

Then you have "-15n = 60"

Divide both sides by -15

n = -4

x = -3

Step-by-step explanation:

2x + 15 = -3x     (try to move the x-terms to one side, add 3x to both sides)

2x + 15 + 3x = 0

5x + 15 = 0 (subtract 15 from both sides)

5x = 0 - 15

5x = -15    (divide both sides by 5)

x = -15 ÷ 5

x = -3

Hope this helps!