Question

Find the missing number so that the the equation has no solutions

-4(-x - 1) + _x = 2x + 19

Answer 1

Answer: -2

Explanation:

The coefficients of x on both sides have to be the same, while the constant terms must be different.

Let the unknown constant be a. Then,

`-4(-x-1)+ax=2x+19\\\\4x+4+ax+2x=19\\\\\implies 4+a=2\\\\\therefore a=-2`