Answer:
blank = - 3
Explanation:
let x represent the blanks , then
(
+ x) =
x +

multiply through by 15 ( the LCM of 3 and 5 ) to clear the fractions
10(
+ x) = 6x + 6 ← distribute parenthesis on left side
+ 10x = 6x + 6
18 + 10x = 6x + 6 ( subtract 6x from both sides )
18 + 4x = 6 ( subtract 18 from both sides )
4x = - 12 ( divide both sides by 4 )
x = - 3