4 - 28x
distribute the parenthesis and collect like terms
= 4x + 20 - 16 - 32x
= (20 - 16 ) + (4x - 32x )
= 4 + (- 28x) = 4 - 28x
To solve equate to zero
4 - 28x = 0 ( subtract 4 from both sides )
- 28x = - 4 ( divide bot sides by - 28 )
x = [tex]\frac{-4}{-28}[/tex] = [tex]\frac{1}{7}[/tex]
