Question

Value of x?

-3(4x + 3)-4(5x + 1) = 79​

Answer 1

-23/8 OR 2.875

Explanation:

Split 「-3(4x + 3)-4(5x + 1)」 out into -3(4x+3) and -4(5x+1):

-3(4x+3)= (-3)(4x)+(-3)(3)

= -12x-9

-4(5x+1)= (-4)(5x)+(-4)(1)

= -20x-4

Substitute it back to the formula:

-12x-9-20x-4= 79

-32x-13= 79

-32x= 79+13

-32x= 92

x= 92/-32

x= -23/8 OR 2.875

Answer 2

-2.875

Explanation:

-12x-9-20x-4=79

-32x-13=79

-32x=92

92/-32= -2.875