Answer:
26
Step-by-step explanation:
let x be a number.
19 + 42 + x = 87.
42 + x = 68.
x = 26.
[tex]\huge\boxed{x=26}[/tex]
Write an equation. [tex]19+42+x=87[/tex]
Add. [tex]61+x=87[/tex]
Isolate [tex]x[/tex] by subtracting [tex]61[/tex] on both sides. [tex]\boxed{x=26}[/tex]
